Fuel pump pressure - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 12-21-2005, 06:36 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2003
Posts: 34
Thanks: 0
Thanked 0 Times in 0 Posts
kennyz is on a distinguished road
Default Fuel pump pressure

I checked the pump pressure on my 94 SE today. Turn the key on to energize the pump and it shoots up to 45 lbs. Start car up and it goes to 35 lbs. Race the engine up and it bounces between 35 and 38 lbs. At idle it`* pretty much a sustained 35 lbs. I`m assuming it`* time for a new pump. Just wondering what kind of symptoms should accompany this type of pressure (35 lbs.) I know specs call for 41-47 lbs.
kennyz is offline   Reply With Quote
Old 12-21-2005, 07:41 PM   #2
Senior Member
True Car Nut
 
Join Date: Dec 2003
Location: Corn Fields, IN
Posts: 2,766
Thanks: 0
Thanked 0 Times in 0 Posts
John Deere Boy is on a distinguished road
Default

Drop your tank and remove the pump before you buy a new one. Chances are you have a clogged strainer. This could let the pump make full pressure with the engine off, but have low pressure with the engine running.

Theoretically, lower pressure will mean larger fuel droplets and less atomization. (less efficiency)
John Deere Boy is offline   Reply With Quote
Old 12-21-2005, 09:57 PM   #3
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Yours actually doesn't sound that bad. What is it if at idle you pull the vacuum line off the FPR? How quickly does it bleed down after ignition on/no start?
willwren is offline   Reply With Quote
Old 12-21-2005, 10:23 PM   #4
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2003
Posts: 34
Thanks: 0
Thanked 0 Times in 0 Posts
kennyz is on a distinguished road
Default

I`m not near the car right now so I can`t check the FPR but bleed down was very quick.
kennyz is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
fuel pressure / leak after new fuel pump static1701 2000-2005 10 12-30-2014 10:10 PM
new fuel pump on my 97 deville, got fuel and pressure no start 1johnse2082 Cadillac 3 07-25-2014 01:15 PM
What does a fuel pressure regulator tell a fuel pump on a Chevy GMC rear wheel drive GunsOfNavarone GMC/Chevrolet Truck/SUV 9 06-01-2011 11:09 AM
No Fuel Pressure - Replacement Fuel Pump ccotten 1992-1999 13 07-25-2007 06:28 PM
Releasing Fuel Pump Pressure to Change Fuel Filter on 94SE mikeblue94 1992-1999 8 10-31-2004 04:20 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:22 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.