Fuel Pressure and Pump?

[Whit]

The LT1 has a regulator on the fuel rail and the Jeep uses an intank pump.
I never checked the pressure until recently when I started having some
strange problems.  The car/pump has 120,000 miles on it and the pump may
just be going bad or may be clogged.  I have a new adjustable regulator and
filter so my plan is to replace the regulator and the fuel filter and check
the pressure again.  I'm pretty sure that won't do the trick but it is an
easy place to start.

I guess I am wondering if the stock pump that is supposed to pump out 35 -39
psi should be able to do a little more.  I seems like another 3 psi should
not be a problem.  Where I might expect problems is at higher rpms.

Thanks,
Whit
>
>
> The LT1 is very sensitive to fuel PSI... In an LT1 Caprice you must run 42
> PSI....
>
> Anything different and it throws the computer way off.
> Wasn't there a fuel pressure regulator on the fuel rail of the LT1?
> It is my understanding you need to feed two lines to the LT1, one is a
> return line and one is the feed line. You should not need a separate fuel
> regulator since the one on the motor should work fine? (I could
> be wrong but
> I was told the fuel regulator is on the fuel rail...
>
> Does the jeep use an in tank pump? If so and they are of a
> similar design as
> the newer jeeps you could always get a fuel pump for the larger V8. Friend
> of mine has a 5.7V8 in his Jeep. Not sure if it is a Jeep motor or a Dodge
> motor. I believe his is like a '95 or something.
>
>
> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Whit
> Sent: Friday, January 18, 2002 11:37 AM
> To: diy_efi at diy-efi.org
> Subject: Fuel Pressure and Pump?
>
>
> I'm running an LT1 in my 89 Jeep cherokee and am having fuel pressure
> problems.  I am wondering if the stock fuel pump will do the trick.  The
> stock pump was meant to run FI on the Jeep at about 35 lbs.
> After intalling
> the motor it is still running about 35 lbs and I understand the LT1 is
> supposed to run in the mid 40s. I bought a new regulator but my
> gut feel is
> that the stock pump is either inadequate or it needs to be replaced.  Any
> have exprerience here?  What are options here?  Can I run a second inline
> pump?  If so, do I need the stock pump at all?
>
> Thanks,
> Whit
>
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