Can my fuel regulator be weak? - Ford Truck Enthusiasts Forums



1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Can my fuel regulator be weak?

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 08-18-2014, 10:00 PM
kevin206's Avatar
kevin206 kevin206 is offline
Senior User
Thread Starter
 
Join Date: May 2010
Location: McMinnville, TN
Posts: 306
kevin206 is starting off with a positive reputation.
Can my fuel regulator be weak?

1989 F-250 5.8L FI
I know that the fuel pressure regulator usually fails because of a busted diaphragm, but can it just become weak?

My fuel pressure is sitting at about 27psi at idle. It goes up a few psi when I pull the vacuum line. I clamped my return line at the tank and the fuel pressure fluctuated between 80psi and 100psi. BTW, the truck ran and idled great at the high pressure.

The symptoms I currently have are low pressure at the fuel test port, rough idle, slight stumble while accelerating. I have replaced my in-tank low pressure pump, replaced fuel filters, repaired kinked lines. I have bypassed the frame mounted dual function reservoir for the time being.
Reply With Quote
  #2  
Old 08-18-2014, 10:22 PM
carguy94 carguy94 is offline
Senior User
 
Join Date: Mar 2014
Location: southern maryland
Posts: 431
carguy94 is starting off with a positive reputation.
remember its a fuel pressure regulator. did you check the pressure when you kick it during a crank key on engine off rest pressure. how a bout a MIL try pulling codes and the only thing the line crimp will do is flood the engine
Reply With Quote
  #3  
Old 08-18-2014, 11:05 PM
UNTAMND's Avatar
UNTAMND UNTAMND is offline
Postmaster
 
Join Date: Jul 2009
Location: Lansdale, PA
Posts: 3,535
UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.
Yes they wear out. It's a spring and a needle valve. Could also have some debris on the seat causing low pressure.
They are cheap. Just buy a new one. Idle pressure with vacuum disconnected should be 39-42 or so. Vacuum connected will lower it some.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Fuel pump vs regulator problem jrappl 1994.5 - 1997 7.3L Power Stroke Diesel 3 03-28-2017 07:54 AM
Fuel Pressure Help failsatheals 1997 - 2003 F150 5 06-21-2016 09:03 PM
terrible fuel problems please help mhobbs 1987 - 1996 F150 & Larger F-Series Trucks 5 06-21-2015 03:24 PM
Is my fuel pump going bad? JSTJ704 1987 - 1996 F150 & Larger F-Series Trucks 19 06-30-2014 06:25 AM
fuel pressure regulator question Mic_bug Explorer, Sport Trac, Mountaineer & Aviator 1 01-11-2005 12:03 AM


Go Back   Ford Truck Enthusiasts Forums >

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

Forum Jump


All times are GMT -5. The time now is 01:28 AM.