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Old 07-11-2009, 09:48 AM
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Default Fuel Pump VP 5.0

Have EFI 5.0 Volvo Penta--- the fuel pump starts making noise then the engine will surge 1000 PRMs----have changed fuel filter and batteries are fully charged---
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Old 07-11-2009, 10:07 AM
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Default buy a service manual before parts

if you want to trouble shoot your EFI system I would recommend buying a VP service manual for your EFI system. I bought a complete set off of e-bay for $25. The fuel pumps are spendy and it could be as simple as the connector being bad. Do you have the pumps together on the filter or are they separated?
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Old 07-11-2009, 11:14 AM
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Pump is one unit-- found online---- price 649.00 for the assembly-- looks like VP doesn't sale the pump seperate like Merc and Crursader @ 165.00 for the pump-- already have the manual-- stated low battery-- water-- obstruction
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Old 07-11-2009, 12:20 PM
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VP,Merc,Crusader are all GM based motors and use those EFI systems, sounds like you have the newer MPI system not the TBI which had a vapor separator with the hi press. pump attached. which manuel do you have? Have you done a pressure check ?
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Old 10-05-2009, 05:53 PM
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New pump fixed it-- wallet a lot lighter
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Old 10-05-2009, 06:13 PM
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Yep, Volvo fuel module. Been replacing bunches of them. You can replace the high pressure pump in them but not the low pressure. And most of the time it's the low pressure one screaming. You should check the low and high pressures now that you have replaced it....I have seen many clogged up pressure regulators lately. Make sure yours isn't clogged..high pressure will be way up there if it is.
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Old 10-06-2009, 06:56 PM
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Thanks will do when I get back to WV-- presently in Fl
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Old 10-06-2009, 07:15 PM
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I have been fighting with my fuel pumps all summer. So I feel for you and I'm wondering what to do.

1996 Volvo Penta FI. (Ford 302)
Initially, my high pressure pump quit. I replaced it, and it ran well for about a week.
Then the Low pressure pump was not pumping enough, so I replaced it and it ran well for another week.
That low pressure pump broke. I replaced it, and it ran well for a month, but then my High pressure pump started screaming. (motor still runs fine)

Check the fuel pressure on the resevoir tank while high pressure pump is screaming. I have no pressure. (I figure thats my problem)

Just completely reconfigured the low pressure pump. (after 2 have broke, I'm going a different route)
I put a Holley Marine 6psi pump in with a seperate fuel filter and ran it straight to the Fuel Resevior tank.
I now have 4 psi on the reservoir tank itself. (2-4psi is where it should be)
My high pressure pump is still screaming at idle and at speed.

Pulled the return line off between the Pressure regulator and the resevior tank. Cranked it up, and that line was pouring fuel. I was told if that happend, the pressure regulator was working properly and not clogged. (I have no idea if that is the correct way to check a regulator)

Currently. Motor runs fine. 34psi on the fuel rail which is where its suppose to be.
4 psi on the resevoir tank, also where its suppose to be.
And a high pressure pump thats screaming like no tomorrow.

I'm about to rip all of it out and put a carberator on there.
Then I can complain about not being able to tune that.


any ideas on mine? and how do you check a pressure regulator?
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Old 10-06-2009, 07:43 PM
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Ken2.....your vapor tank is water cooled and if not keeping the fuel cool the pump will scream. It flows water through 2 large hoses but if I remember it has a small line to the thermostat housing that likes to clog. Those tanks like to internally corrode in the cooling area and not keep the fuel cool enough. Just something to look at.
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Old 10-06-2009, 07:54 PM
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Insufficient cooling thru the vapor tank is what was causing my high PSI pump to scream. Once i cleared the obstruction I flushed the tank and cooling water lines with vinegar and let sit overnight. Flushed it all out the next day and haven't had a problem since.
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Old 10-07-2009, 05:43 AM
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I'll definately look at that.

My pump screams within 5-10 seconds of starting the engine. Do you think it can get hot that quickly?

I'm going to take the hoses off and clean them regardless though.
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Old 10-07-2009, 10:40 PM
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My cooling system is a "half system" (just the block see's fresh water) the pluggage was where the hose connects going to the exchanger going to the vapor tank.
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