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Levrmcd

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Ok I'm new to boats... I bought a 99 wellcraft Martinique 2600...the previous owner put in an truck fuel pump in the tank... I have two questions.. First all of the electronic fuel pump assembly is missing.. What all do I need and where can I look... Second question... The boat starts and idles fine... But when put under a load it dies... I can hear a vacuum leak and the current pump hold 55psi under load... Any ideas what the problem could be.. Any help or advice is greatly appreciated
 
First off... car parts go in cars, boat parts go in boats. There may be very little or no apparent or technical difference between the truck fuel pump and the fuel pump that was originally installed in the boat. Except, fuel and electrical components are manufactured and certified to meet Coast Guard regulated standards. Call it pedigree. A lot of folks will claim it to be expensive and unnecessary, but it is what it is. The reason for it is the countless boat fires and explosions that the CG has been called to answer.
Some other engine parts (very few) can be interchanged, but you'd always be running a risk. In many cases, the boat engine parts and car engine parts come from the same mold. But parts intended for marine use do go through a more stringent screening and inspection process... more of tha pedigree stuff, thus the added expense. You can decide on your own if the added expense is worth it to you. If you decide to go the cheaper route, please be courteous enough to break down away from the boat ramp... others are waiting.
Car and boat engines perform at completely different levels. A boat on-plane making 25 or 30 knots is the equivelent of running you car on a 30% upward slope at full throttle. You might do that in your car for 5 or 10 minutes every couple of months... your boat will do it nearly it's entire life.

For your specific problem, After getting the right fuel pump, I would replace the fuel/water seperator and see what that gets you.
Find the vauum leak and fix it... With the engine idlling, you can usually find a leak by feeling, and listening in some of the suspect areas... intake manifold to cylinder head joints, carb to manifold joint, etc. If you can't find it that way, sparingly spray a little WD-40 on the joints and see where it gets sucked in, or when the whistling stops... that's your leak.
Next, since you just bought the boat, what's the history with the fuel that was in the tank? Did the previous owner leave the tank full?Was the boat sitting for a long time before you bought it? Was stabilizer added to the fuel? Stabilizer is a must-have at every fill-up.
 
Yes... Changing the fuel pump is my first step of course... Like I said this was someone else's work.. Not mine... I know about the wrap hole at the top that will spill gas to the hull... What I was asking is since there isn't an existing marine fuel pump or any of the other components for assembly... I have no clue what I need and haven't been able to locate it online... And I have drained the gas and put sea foam and other cleaners in
 
We've seen situations like this on this forum alot.

Too late for this poor guy, but this a perfect case that puts an excailation point on the statement:

Get the boat surveyed before you buy a boat! Especially if you're a first time buyer.

A resonable seller would cover the cost of the survey in the price of the boat. Otherwise, they're trying to hide something.
In that case, don't walk away, RUN!

A surveyor would of flagged this imediately and would have refused to even run the engine, let alone a sea trial, until the seller got it fixed.
 
take a pic of the fuel tank pump cause a boat does not use a in tank pump because the rubber lines cannot take the pressure of FI
throttle boby , MPI or TPI
 
Well I knew the fuel pump was bad... But everything else on the boat is really nice.... I only paid 4k for the boat do I feel either way I still did good
 
So does that service bulletin have the info you need for the pump/cooler assembly?

Hope everything works out for you.

I'd take another good look stem to stern for other Rube Goldberg'isms.
 
Levrmcd said:
Yes I believe it did... However like I said I don't even have a fuel line for it... I sure appreciate all your work and help
Click to expand...

Actually, that's the first you've mentioned anything WRT missing fuel lines.

Which fuel line(s) are you missing?

Post your engine's serial number, I can verify the fuel pump/cooler assembly number I posted earlier and find the part numbers for the fuel lines.
 
I couldn't find the serial number but it's the factory 454 7.4 liter fuel injected on a 99 Martinique... Could you still help... I want to order the pump and everything in the morning
 
Levrmcd said:
I couldn't find the serial number but it's the factory 454 7.4 liter fuel injected on a 99 Martinique... Could you still help... I want to order the pump and everything in the morning
Click to expand...

Ayuh,... That narrows it down, but doesn't pin-point what yer motor is...
 
Ok all I know is it's. 99 motor with the multiport injection... 454 7.4 liter mercruiser... I've got the boat running but is sputtering out under load and back firing
 
Verify that the plug wires are on the right plug. Make sure.. get that out of the way. Verify each plug is firing. Get to the timing and verify that. Get back to us.
 
You're going to need to find that serial number. I can give some part numbers, for what I think should fit, but I'd only be guessing. If nothing else, get the hull number, stampted on the transom, call the boat manufacturer. They should be able to tell you what engine was installed in the boat. With that, we'll need to make sure that it's the original engine.
 
The drive number and the engine number, although very similar, are different... but the "OL" part of should get us close enough and it matches the year.
Assuming it's the original engine matched up to the drive you gave the number for:
Go to this website:
http://www.mercruiserparts.com/sele....4L+BRAVO+(MPI)(GEN.+VI)+GM+454+V-8+1998-2000
Click on the serial number hyperlink. You should find everything you need. The pump/filter number I gave you above should be correct. You can put that part number in the part number search on the website above and you'll be able to buy it.
The parts side of this website also has an aftermarket pump that is a little cheaper.
 
The guys are offering you some great advice. I would take heed!

Troy's post #9 nails it. A survey should have been performed, and would have been money well spent.


It's possible that the previous owner also installed an automotive MPI system, and that may be why he used the automotive fuel pump as well.
It would be great to see some phots. One of the guys may see something that you may not be seeing.


Levrmcd said:
Ok I'm new to boats... I bought a 99 wellcraft Martinique 2600...the previous owner put in an truck fuel pump in the tank... I have two questions.. First all of the electronic fuel pump assembly is missing.. What all do I need and where can I look... Second question... The boat starts and idles fine...
Click to expand...
Question: If the fuel pump is missing, how were you able to operate the engine? Or did I misunderstand you?

.
 
Yes, I understood that part..... but why?
If this person lacked the better judgement to have known better, the question becomes; what else did he use that is not Marine????
That was my point!

How 'bout some photos?
 
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