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Strange phenomenon with noisy main fuel-pump 200 1985

posted by  Bob Wennerstrom on  Sat Aug 20 17:01 CST 2005
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last visit: Fri Jul 15 12:01 CST 2011
[RELATED]

Read my saga a few posts down from yours.

I should be a real expert at this. I've had the in tank pump out about a dozen times and the main pump out five or six times over two episodes already. Like yourself, I have pinched the supply line to the main pump and heard quieting in dismay.

From my experience, when the main pump is noisy, the problem has always been the pre-pump and has never been the main pump.

I think I got a bad prepump out of the box in one episode and that made me go off track and do the 740T pump upgrade thing. That lasted a few years until a piece of plastic got stuck in the impeller.

Here's what I'd do. Prepumps are cheaper than main pumps. If you're going to guess without pulling the bung off the tank, start there. I've actually bench tested them, though you've got to be careful of sparks and don't run them more than a few seconds in open air so they don't overheat. Plunk down your $160 on a main pump as a last resort. Or jerk one from a boneyard.

Just my .002


--
Volvo Farmer:

21 Volvos '58-'91

445-544-122-144-1800-240-740

sorry, no FWD






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