lift pump pressures

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Nov 25, 2003 | 02:50 PM

williem

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lift pump pressures

I'm getting 15psi at idle; but only 8psi at 2500 rpm. What should they be?

Nov 25, 2003 | 04:35 PM

Palmetto_kid

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From: Sweeny, Texas

Re:lift pump pressures

sounds avearage to me.

Nov 25, 2003 | 05:00 PM

Shovelhead

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From: Central VA

Re:lift pump pressures

I see 15 at idle
13 at 2000 rpm cruise
11 at WOT

Nov 25, 2003 | 05:17 PM

PHX_ATC

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From: Mesa, AZ

Re:lift pump pressures

15 to 16 at idle
12 at 2000rpm at 70mph
9-10 at full throttle

Nov 25, 2003 | 05:50 PM

RATTLINRAM

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Joined: Aug 2001

Posts: 3,529

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From: Disputanta, Virginia

Re:lift pump pressures

I've got 15 at idle
13-14 @ 2000 rpm cruise
11-12 @ WOT

I think the Wildcat fuel line upgrade really helps my pressures stay up. ;D I used to drop down to around 10psi @ WOT when towing the 5er up long grades in the mountains, even after the new lift pump was put in.
Not a problem now! ;D

Nov 25, 2003 | 07:33 PM

j-fox

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Joined: Mar 2002

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Re:lift pump pressures

My guess is one of two things--Either you have a fuel filter plugging or a lift pump going to the trash.

I don't think you want it to go below 8 under load and rpm.
This pressure feeds fuel to the injection pump to lube it. A lot of injection pumps die with 0 pressure.
What year you got? 01 and 02 pumps are said to be better than earlier ones.