Fuel Pump pressure drop - 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 07-06-2011, 03:55 PM   #1
Junior Member
Thread Starter
 
Join Date: May 2007
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
wtroger is on a distinguished road
Default Fuel Pump pressure drop

1997 Bonneville SSe checked fuel pressure while running and it right at 50 psi. turn key off and it drops off to 0 with in about 5- 10 secs. turn key on but don't start and it will only make about 25 psi. As a result it starts a little ragged until pressure comes up. The question here is this a pump problem or something else. FPR or leaking injector. Car runs great after starting no shudder going down the road and no engine codes.
wtroger is offline   Reply With Quote
Old 07-06-2011, 04:06 PM   #2
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

sounds like fpr. take the vac line off and smell for gas, if you smell gas its bad for sure. it seems likely anyway
jwfirebird is offline   Reply With Quote
Old 07-06-2011, 04:26 PM   #3
Senior Member

True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

x2 on the FPR.
2kg4u is offline   Reply With Quote
Old 07-06-2011, 06:41 PM   #4
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Yep, FPR. If that checks out, you may have a leaking injector or a bad fuel pump. But chances are, the FPR is bad. Do you have hard starts?
Danthurs is offline   Reply With Quote
Old 07-06-2011, 11:24 PM   #5
Junior Member
Thread Starter
 
Join Date: May 2007
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
wtroger is on a distinguished road
Default

I may have fixed it this evening. Daughter took it to work this Am and it quit about a mile down the road they towed it back to the house. This evening my daughter was messing with it and smelled fuel found main fuel line had come off the rail. This engine had been replaced by PO not long ago I guess the clip didn't get put on. Put a green clip on and cycled the key once and it fired right off and idled fine. will check pressure Tomorrow and see how it acts thanks for the input.
wtroger is offline   Reply With Quote
Old 07-07-2011, 12:42 AM   #6
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

That could have been real bad. No messing around with fuel lines.
Danthurs 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 10:57 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.