RE: RE: JPOR: Engine trouble

[RICH SCHAEFER <RSCHAEFER@xxxxxxxxxxxxxxx>]

try this (and don't laugh)
but have you ever driven the truck without a gas cap?
sometimes, the vent line or the charcoal canister gets clogged and the tank
can't pull in fresh air to displace the gasoline bieng pumped out. if your
vent system is clogged, then your pump will be fighting a vacuum in the tank
and won't pump as much fuel. that would do exactly what you're talking
about. If you run the truck without the gas cap, and your problems
dissapear, then the prob lies in your tank vent system.  This is rare thing
to go wrong, and I've seen this problem maybe 4 times in my life.

rich

- ----- Original Message -----
From: Chris Waterman <Chris_Waterman@pmc-sierra.com>
>
> Got a problem that's come up recently with the 5.0L (EFI) in
> my YJ.  Sometimes, when I start the engine after it's been off
> for a little while (still warm), the truck will be almost
> paralyzed.  Idles fine, but give it any gas and the engine bogs
> down almost right away.  No power at all...  VERY annoying.
>
> When it's cold, the Jeep runs fine.  A bit less power than I'm
> used to, but no bogging.  It continues to run fine until I shut
> it down.  This problem has only recently cropped up, so I don't
> really know the symptoms too well yet.
>
> My first thought when the bogging began was the fuel pump.
> Replaced the pump (and pressure regulator) but no dice.
>
> Anyone???  Does this sound like vapour lock at all?  My exhaust
> and fuel lines are nowhere near each-other, but I'm running out
> of ideas!
>
> TIA,
> Chris (It's an injected 5.0L, BTW)

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