I just bought a 99 S-10, 4x4, 60k, auto, 4.3, extended cab... beautiful
truck. Anyway, that was about a month ago. For about 2 weeks now, it's
been having the oddest fuel problem I've heard of.
For the most part, the truck typically runs fine. But for apparently no
reason, the fuel pump will sorta "spool up", get loud (I know they're
usually loud, but it suddenly get REALLY loud), and the truck will idle
rough and die if I don't keep on the throttle. But it will start right
back up like nothing. The only thing that fits in to make any sense is
that it seems to happen more often when the tank is below 1/2. Also,
when the fuel pump does its loud spooling up thing, I notice that my
guages, specifically the tach and speedometer, dont read correctly and
jump up/down quickly instead of gently like normal.
Myself, my buddies, and the local mechanics are all stumped.
So I'll list the possibilities I've come up with.
1) Fuel pump - But if the pump is bad, why would the truck start right
up again? Sending unit?
2) Fuel filter - Changed it, didn't help
3) Water in fuel - Maybe... I ran dry gas through it already, seemed to
help for just that tank, maybe I should run more?
4) Electrical - Unfortunately, sounds like the most probable thing at
this point. It has a ram air hood... is it possible that water got
where it shouldn't have and screwed up the electrical system? I did
notice that my drivers side carpet always has a little water pooled on
it and I havent found the source.
I'm new to the S-10, so I'd appreciate any help I can get with it.