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A//// Guy
08-25-2010, 02:56 PM
I highly doubt your fuel filter is clogged with only 40k on the clock, you also would have noticed junk on your pumps prefilter if that were the case, but Id replace it anyway just to rule it out. Im leaning toward your pump being the problem.
asshanson
08-25-2010, 03:58 PM
Oh, I forgot to mention. Last week when we had the pump out of the tank to install the check valve, we noticed that the sock had fallen off the pump. This could have easily caused some junk to clog the filter or make the pump weaker.
My question is, what happens when the sock comes off, besides not pre-filtering? Does it affect the flow without the sock on?
turbotalon1g
08-25-2010, 05:29 PM
I don't think so, from what you are telling me I would suspect the pump.
asshanson
08-27-2010, 08:01 PM
Replaced the fuel filter, didn't fix the problem. Installing a new pump tomorrow, hopefully that's it.
asshanson
08-29-2010, 03:53 PM
Replaced the pump with a brand new 255hp, still has issues around 4500rpms.
TalonFiero
08-29-2010, 04:39 PM
Fuel pressure regulator?
turbotalon1g
08-29-2010, 04:39 PM
Well I'm kinda glad that its not the pump, but I'm really surprised. Good luck.
asshanson
08-29-2010, 07:43 PM
I doubt it's the regulator. It holds about 60psi pretty steadily just cruising around, so I don't know why it would drop pressure under high load. It's in the tank, it's a returnless fuel system.
I'm going to test the fuel pump voltage, see if my boost a pump is failing maybe.
TheBlizzard
08-30-2010, 07:57 PM
Yeah I was just going to say check the voltages under load, you could have a loose connection or a failing boost a pump like you mentioned. Weird issue though.
C3L1CA
08-30-2010, 09:28 PM
Do you still have it hooked up to the little dial switch?
Mine would go lean under boost and thought it was my maf at some point, turns out those dials go bad.
Try cutting the wires that go to the dial for lean/rich and solder them together. This will cause the boost a pump to run at full voltage all the time and fixes the dial switch problem.
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