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Failing fuel pump or pumps? 700 1991

posted by  N7SC on  Sun Oct 26 15:48 CST 2008
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last visit: Sun Jul 7 14:12 CST 2013
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Symptoms: It began with an occasional bit of hesitation, like I very briefly lifted my foot. It was so little and so subtle that I did not know if it was really happening or not. It usually happened at cruise on open roads. Eventually it became bouts of surging idle, stalling at idle, and it seems like some problems at times stalling on turns, and now clearly noticable hesitation at cruise, like I lifted my foot. Severe enough that at times I think it might die at cruise. It does stall at idle sometimes. The level of fuel in the tank seems to make very little difference. Maybe completely full tank is a little better, but the symptoms appear at 1/2 tank or even 3/4 tank sometimes.

Here is the fuel pump history: Replaced main pump just over two and a half years ago. It was 15 years old, the original one from the factory. It sounded like a rock crusher when it ran. Failure was that it would not always start, but if you got it running it would stay running.

Replaced it with the Bosch OEM pump and a new fuel filter. New pump was just about silent. For a few weeks or so, then it began making a little more whining noise than it had before. Checked in-tank pump, and that had failed. Replaced it. All was silent again. But, within a month or two the main pump began making whining noise again. I figured that the in-tank pump could not have failed so soon and just lived with it. That was nearly two years ago. The noise the main pump makes is nowhere near as bad as the original pump did when it failed. Then the symptoms above started and are progressing fairly rapidly.

I just checked the in-tank pump and it is dead. I have no idea how long it has been dead.

Does it sound like the main pump is failing too? In addition to replacing the in-tank pump, should I go ahead and order a main pump too, just to be on the safe side?
--
Scott Cook - 1991 745T, 1985 RX-7 GSL-SE, 1986 Toyota Tercel (Don't laugh, it is reliable, faithful AND gets 41 mpg!)








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    Failing fuel pump or pumps? 700 1991

    posted by  mmal231294 on  Mon Oct 27 01:34 CST 2008
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    last visit: Fri Mar 18 12:34 CST 2011
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    I had a similar experience last year. Had two bad in tank pumps in a row, from FCP, they were a/c delco's. For the third I went with the "upgraded" in tank pump kit from IPD(ask for Ken he know the number). It is a slightly longer unit so fitment requires some slight modifications. It was a couple bucks more but I found it to be a real PIA job so opting for the bigger pump(maybe less likely to die) made sense to me. Main pump will be fine as long as you dont run it with the dead in tank pump for too long. Good Luck.







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