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Interesting fuel pump "failure"
Posted by damien [Email] (more from damien) on Fri, 25 Jan 2002 12:59:33
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1998 900 SE Turbo 70k miles
For a couple months the car was stuttering when the gas gage got below 1/4 tank, usually on long turns and sometimes starting off from an intersection (bad times to lose power). The stuttering was pretty bad and the check engine light would come on (for misfiring I presume). Fill it up, and all was fine again.
Since this was suspiciously similar behavior to the fuel pre-pump failure in c900's (before the 1-piece Walbro pump was introduced), I decided to drop the gas tank and look at the pump.
Well in a nutshell, the priming bucket that the pump operates in was *shattered* with a big spiral fracture!! Without the priming bucket, the fuel pump was sucking air whenever the gas dropped below the level of the main inlet. Removing the assembly was easy but I obviously could not put it back in like that. Luckily I had a spare pump sitting around from a 1996 9000 Aero...guess what...same part number, same pump. I swapped on the good bucket and now runs like new.
My best guess is that I (or someone that borrowed the car) ran over something very hard, and it smacked the gas tank bottom (no obvious marks though) hard enough to thwack the pump bucket and break it.
My gas gage is reading a little high now, does anyone know if there is an external tweak to adjust it, or do I have to drop the tank and bend something back into shape? Thanks.
posted by 63.207.9...
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