Fuel Pump Replacement In A Mercruiser 260 Boat Engine

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3 жыл бұрын

fuel pump (PAID LINK): amzn.to/3qQNTvg
DISCLOSURE: As an Amazon Associate I earn from qualifying purchases.
How to replace a fuel pump in a Mercruiser 260/Chevy 350 boat engine.
I'm replacing the fuel pump in my 1984 Ranger 395-V i/o. Want to see what the inside of a 36 year old fuel pump looks like? Go to minute 7:08 to see that!
Check out my other KZfaq videos on boat repair here:
• Bass Boat Repairs
#fuelpump #Mercruiser #Chevy350 #mercruiser260 #Rangerboats #Ranger395Vio #inboardoutboard #boatrepair #boatenginerepair #bass boat restoration #prowrenching
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Pro Wrencher is a mechanic who has experience repairing everything from old farm equipment to autos/trucks/boats to locomotives. He lives in an old house and drives old cars and has old boats- giving him a lifetime of stuff to repair!
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@ProWrenching Жыл бұрын

fuel pump (PAID LINK): amzn.to/3qQNTvg DISCLOSURE: As an Amazon Associate I earn from qualifying purchases.

@MrKNOX2k Ай бұрын

Great video 💪🏿👍🏿👍🏿

@ProWrenching Ай бұрын

Thank you! Much appreciated!

@jmilz08 2 жыл бұрын

What a luxury of having the engine out of the boat ha

@JulioRodriguez-js6vm 2 жыл бұрын

Excelente vídeo!!!! 👏👏👏👏👏 thanks a lot!!!!

@ProWrenching 2 жыл бұрын

Thank you

@dealerofburningsalt3649 3 жыл бұрын

Good video, unfortunately I installed sierra fuel pump made by carter last season and got about 10-15 hours out of it. Don't know what else to get?!?!?! Carter was made in Taiwan new amazon special made in China and all honesty I don't have my hopes up for this one. ANY GOOD USA MADE PUMPS OUT THERE???

@gherickb8181 3 жыл бұрын

My friend there is any way to check the water flow I see on my engine is getting out just a little I don’t know how to check that mercruser 3.0

@ProWrenching 3 жыл бұрын

Ok. Are you running the engine connected to the water hose?

@gherickb8181 3 жыл бұрын

Yes and for the outlet I see little water coming out but this boat was really bad maintenance so I want check if some inside first

@ProWrenching 3 жыл бұрын

It can be hard to tell from the hose. The best flow is in the tank or submerged in water. You want to check the temperature gauge to make sure the engine is running in the correct range. It is a good idea to replace the water pump impeller and thermostat if you do not know the service history. I have a video on both of those as well How to Replace the Thermostat on a Mercruiser 260 kzfaq.info/get/bejne/mt97lNNhqs-rdqs.html

@ProWrenching 3 жыл бұрын

In addition to my previous reply, this may also help you: How to Install a New Water Pump on a Mercruiser 260 kzfaq.info/get/bejne/Y9lheJyGnZyldXk.html

@deano7239 2 жыл бұрын

Thank you for your videos they have helped me understand more about my engine. I have a recently purchased 1986 Condor Mach 1 with the same engine as this video. The problem I'm having is out of the water and unloaded she goes through the full rpm range. In the water and under load I can't get her over 3000 rpm and she refuses to have any power out of the hole. I can eventually get her to plane out and run all day at 31mph and 2800 rpm but I can't get any more. I replaced the cap plugs wires and fuel/water separator. Any other thoughts? Thank you for your time!

@ProWrenching 2 жыл бұрын

Thank you! I'm glad my videos are useful. Since the boat is new to you, I would ck the adjustments like throttle linkage, engine timing, change all the fuel filters etc. You'll want to make sure that the throttle is opening the carb all the way. My guess would be that the carb probably needs to be rebuilt. Most of the power comes when the back barrels of the quadrajet open up and you will hear it when it happens. I have a video of my engine running on the water and you can hear that on that video. kzfaq.info/get/bejne/otiol5R2ypybZZc.html

@deano7239 Жыл бұрын

Thank you!

@AirKaos 5 ай бұрын

hey man, awesome video! really appreciate it. My 5.0 Mercruiser TKS keeps stalling out in idle after being warmed up. I had it running for an hour in idle after a cold start, thought it fixed itself! Turned it off then back on deliberately to see if it would stay running, but it just kept stalling after each subsequent start. Think it could be the fuel enrichment module aka TKS module? Or more likely the mechanical fuel pump? (I should also add the boat continues to run if I had power and will not stall)

@ProWrenching 5 ай бұрын

It’s really hard to say- kind of sounds like carburetor problems. I would start off by making sure you got good clean fuel filters. Check your carburetor adjustments. Glad you liked the video- thanks!

@NunYa953 2 жыл бұрын

This video is so good, I can smell gasoline while watching it. 😆

@ProWrenching 2 жыл бұрын

Thanks!

@lh98 3 жыл бұрын

I have a mercruiser 5.7 carbed model circa 1995. I think it may have been repowered at some point because the cover that sits over the carb says mercruiser 5.0 I had to pull the heads had shop resurface them and replace the blown head gasket. The 5.0 gasket didn’t fit, 5.7 gasket sure did. I am probably the third owner or so and it originally had a mechanical fuel pump probably. When I bought it it has an electric fuel pump and it’s been an issue. Once up and running it’s fine but when the boat sits for days between uses it’s a bear to start again. If I hook the fuel pump direct to battery to reprime it I will get gas squirting when I hit the throttle to start it. It’s wired to an oil pressure switch that SHOULD be activating the fuel pump via the starter wire that’s also connected to the oil pressure switch then once started the power should come from the key on purple wire to another terminal on the oil pressure switch that’s normally open until it sees 5 psi. It takes lots of cranking before fuel pump kicks on and can be heard. It’s a new oil pressure switch from maybe 10 months ago. I just want to be able to turn the key and start it. Are electric fuel pumps supposed to lose prime as they sit? Is there a check valve in the fuel pick up tube inside the tank? I’m at a point where if it’s been sitting I’m going to connect straight power to prime the fuel pump first, squirt fuel in the carb, disconnect straight power and do first start up that way every time. Boat shop gives me wiring diagrams but it is connected correctly. Another bad oil pressure switch already? All I know is the added on electric fuel pump has been nothing but a pain in the ass this whole time. Any input greatly appreciated

@ProWrenching 3 жыл бұрын

The newer model carburated Mercruiser engines come with electric fuel pumps. It sounds like you may have a couple of things going on. It sounds like your carburetor may be leaking the fuel out of the fuel bowl. This is a common problem on the quadrajet carburetors and there are some plugs on the bottom of the carb that can be epoxied during the rebuild process to fix that problem. If the fuel bowl is empty when you try to start it, you will have a very long crank time until you get that fuel bowl filled up. If it runs fine after primed and started- this carb is your main issue. You may also want to check the fuel pressure of your fuel pump. I believe those are supposed to be somewhere between 3-7 psi, depending on the model. Its also a good idea to install new fuel filters. Plugged fuel filters can cause a restriction. I hope this helps you.

@skmg2888 3 жыл бұрын

How many gaskets go in? My kit came with 2 thin gaskets and 1 thick harder gasket , do I install all 3? In your video it looked like you just installed the thinner gasket ? Also, what silicone did you use for the access bolt?

@ProWrenching 3 жыл бұрын

Yes- i just used the thinner gasket. I matched the original gasket that was on the motor. You want to use the same thickness of gasket that comes off your motor. I used black RTV silicone.

@skmg2888 3 жыл бұрын

@@ProWrenching thanks, does the oil need to be drained before removing the fuel pump?

@ProWrenching 3 жыл бұрын

@@skmg2888 nope. The fuel pump sits above the oil pan so it doesnt need to be drained out.

@JulioRodriguez-js6vm 2 жыл бұрын

a question please 🙏🙏🙏: is a good idea to connect also an electric pump together before the mechanic pump? Or eliminate the mechanic pump to install only an electric pump? Or only use a new mechanic pump???

@ProWrenching 2 жыл бұрын

You should only use the new mechanical pump. Don’t use the electrical pump- you shouldn’t need it.

@JulioRodriguez-js6vm 2 жыл бұрын

@@ProWrenching thank you !!!!!🙏🙏🙏👍👍👍👍👍👍👍

@brandonmorgan7327 2 жыл бұрын

Question. I'm new to boats and I am mainly used to newer engines. It's my first time having a carbureted engine. I have a 1985 mericruiser 350 engine in my boat and it doesn't seem to be getting fuel to the carburetor. I replaced the fuel filter, added new fuel, and still nothing. Also, the boat has 2 gas tanks. How do I know which is active? If anyone can help me with this, I'd be super grateful.

@ProWrenching 2 жыл бұрын

Start at the carburetor and work backwards. If you’re not getting fuel to the carburetor then check to see if you’re getting fuel to fuel pump. If not, follow the fuel line back to the tank and the selector valve until you find the problem. That’s how you’ll figure out which gas tank is active, too.

@Mx_737 Ай бұрын

I have a 454 Mercruiser with mechanical fuel pump. It has a bulb fuel primer going to fuel water separator filter. Do a really need a hand bulb primer at all? Shouldn't the mechanical fuel pump work fine?

@ProWrenching Ай бұрын

Mine doesn’t have a primer bulb. It could come in handy if your boats been sitting a while, would prevent the extra cranks from the fuel pump having to build up fuel in the carburetor.

@Mx_737 Ай бұрын

Thanks for the reply, great video!

@stevestrasburger494 2 жыл бұрын

So assuming a person pulled the vacuum line off and it had gas in it the pump would be bad, correct? There should never be gas in there for any other reason?

@ProWrenching 2 жыл бұрын

Yes- that would be bad. If there’s fuel in the line, it would be from the diaphragm of the fuel pump leaking so the pump would be bad.

@Natter20002 2 жыл бұрын

Hey man. Using a lot of your videos. Just grabbed an 85 260. Just bought the Sierra pump. Came with 3 gaskets. I’m assuming this is so they can fit different applications but they are all the same shape. One is thick snd I don’t know if writing should go on the motor side or pump side. The other two appear same thickness. Ha

@ProWrenching 2 жыл бұрын

Hey- great to hear, glad you’re finding my videos helpful! All 3 gaskets will work, but try to match up the thickness of the original gasket if you can. If you can’t tell- just use the medium thickness gasket. I’ve installed the writing both ways, so it shouldn’t matter.

@Natter20002 2 жыл бұрын

@@ProWrenching thank you ! Appreciate it. Yup I’m going to eventually do the impeller and thermostat, cap rotor and wires yadda yadda. It ran great at idle but after about 20-30 seconds at 3/4 power it died. Had to blip throttle wide open to get it to catch while cranking starter and keep blipping to get it to hold idle or if I didn’t play with it right after catching it would die. After about 5 blips it was back to normal and would idle great all day long. Once I slowly sped up to 2000 rpm it died again. Then same restart thing snd I idled it back to the dock. Just waiting for the last of the parts now and hoping to resplash here In a week. I’ve only had it in the water that one time. At home sure enough starts great, runs at idle perfectly, can blip throttle without stumbling. Unable to duplicate issue on trailer. This is a big beast of a trailer boat so it’s not fun to launch and test. It’s a Santa Cruz 26 (made by carver ) I was pushing on the wires off the distributor cap and got electrocuted on the wire in the center of the coil so yeah new wires coming too. And plugs. Try some ignition stuff snd some fuel stuff. Almost feels like it was flooding.

@ProWrenching 2 жыл бұрын

@@Natter20002 It sounds like it could possibly be a carburetor issue. May need to rebuild the carb. Also check the choke. It’s good to have new plugs, new wires (like you said), check the timing, no loose wires at the battery or ignition coil. You might pull the dipstick & see if the oil smells like gas. That’s a sign of flooding. Good luck with your repairs. Hope you get on the water soon. Stay tuned- got more videos coming later on installing new exhaust manifolds.

@Natter20002 2 жыл бұрын

@@ProWrenching I can handle that. Have a kit you recommend ?

@ProWrenching 2 жыл бұрын

@@Natter20002 I used the Sierra 18-7095 carb kit. You may also need to buy a float separately if yours is saturated with fuel

@ghostnumber717 2 жыл бұрын

My fuel pump is leaking oil lol I suppose it's from that cam in the block. I ordered one so thanks for the video

@ProWrenching 2 жыл бұрын

Thanks! Yep- a bad gasket between the fuel pump & the block will cause an oil leak. That is a good time to change your fuel pump.

@ghostnumber717 2 жыл бұрын

@@ProWrenching you ever do one while the boat is in the water? I'm worried gas n oil is going to spill all over the nice marina I'm at

@ProWrenching 2 жыл бұрын

@@ghostnumber717 No, I haven’t. The biggest risk is a fuel spill from the fuel tank when you disconnect it from the pump. The safest bet would be to do it out of the water, in my opinion.

@ghostnumber717 2 жыл бұрын

Hey just a quick update, upon inspection, I don't have a bolt on my access hole!!! Wow.. I really appreciate this video now. Anyone kno the size of the bolt?

@ProWrenching 2 жыл бұрын

@@ghostnumber717 I’m not near my boat to check for sure, but i believe the bolt is a 3/8” thread. Very short, maybe like a 1/2”. You don’t want a long bolt on there b/c it will interfere with the push rod that runs ftom the cam to the fuel pump. You’ll want to install it with some RTV gasket sealer on the threads so it doesn’t leak oil.

@seeforyourself7841 3 жыл бұрын

Did you have to pull the motor for this job?

@ProWrenching 3 жыл бұрын

No- I could have replaced the fuel pump on my boat w/out pulling the motor, however I already had the motor out so I could replace the gimbal plate. I recently purchased the boat and the fuel pump looked original & I don’t kmow the service history on it, so I changed it out.

@michaelstratton4629 2 жыл бұрын

What is the name brand of the pump And where do I order. Thank you 88 bomber vanguard omc 5.7l

@ProWrenching 2 жыл бұрын

Here it is: fuel pump I used (PAID LINK)www.gopjn.com/t/TUJGR0tFTUJHSEVJR0lCR0hISUtM?url=https%3A%2F%2Fwww.westmarine.com%2Fbuy%2Fsierra--18-7283-fuel-pump-omc-509404%3B-mercruiser-861678a1-97401a2--1653138 DISCLOSURE: If you purchase thru the above link, I will receive a small commission at no extra charge to you. Thank you!

@DougFrantz 11 ай бұрын

Oh I forgot about that stupid rod. I don't normally work on Chevy motors, but I had done a fuel pump once before on a friends Vette and that cause much swearing.

@ProWrenching 11 ай бұрын

Yes, those rods can be very frustrating and if you do enough of them you end up coming up with different tricks to help you get the job done.

@wesleyevans8368 Жыл бұрын

I need to see this done without the engine out 🤦‍♂️. I need to replace it on my 79 Formula. My worry is I can’t see the mechanical shaft when placing it on. Then what..? 🤷‍♂️

@PeterandRowan Жыл бұрын

was this real time? in other words, how long did it take you to do this job? 20 minutes? TY. Peter

@ProWrenching Жыл бұрын

It was edited. Probably took a couple of hours total between rounding up tools and misc cleaning, etc.

@domdom7783 2 жыл бұрын

Can i install the pump without using the bolt hole to hold up the rod?

@ProWrenching 2 жыл бұрын

Yes- but you’ll have to push the rod up and then slide the pump lever under the rod.

@domdom7783 2 жыл бұрын

@@ProWrenching i can push it up! But it maybe goes half way , is it way to get it completely up? Thank you

@ProWrenching 2 жыл бұрын

@@domdom7783 You can turn the engine over by hand. It will give you more room by turning the camshaft which pushes the fuel rod down.

@MrDerinharris Жыл бұрын

I don’t have that access bolt what can I do

@ProWrenching Жыл бұрын

You should be able to take a screwdriver and move the fuel pump rod higher so you can install the fuel pump. If you were unable to move the fuel pump rod high enough then you will need to rotate the engine so that the cam shaft lobe is on a lower point to allow the fuel pump rod to go into a higher position.

@vjportillo 2 жыл бұрын

Dude where did you get those gloves I may have to go to confection for coveting them

@ProWrenching 2 жыл бұрын

lol! (PAID LINK) advanceautoparts.rt8x.net/c/2616027/92624/2190?prodsku=12522558&u=https%3A%2F%2Fshop.advanceautoparts.com%2Fp%2Fautowurks-super-duty-orange-nitrile-disposable-gloves-extra-large-100-count-special-diamond-shaped-texture-g10400n%2F12522558-P&intsrc=PUI2_651