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Fuel pump runs but not pressurizing system??

  • Thread starter Thread starter Mustangx3
  • Start date Start date Jun 7, 2007
M

Mustangx3

New Member
Jun 7, 2007
2
0
0
Jun 7, 2007
#1
  • Jun 7, 2007
  • #1
Here's the deal... 1992 GT, 109k miles, 5.0 stock system... ya turn on the key, pump is heard running happily along but never pressurizes the system or turns off like it used to do. I can hear a little rattle or buzz that seems to come from the lower glove box area (or outside in the engine compartment near the rear passenger firewall). It sounds like the gasoline is rushing through the fuel rails and right back to the tank without reaching pressure (just sort of recycling). If I let it continue like this for a few minutes it will suddenly make a loud click from that firewall area and the pump will shut off (system pressurized now). Now the engine will start and seem to run fine until the next shut down then the whole process starts over. Of course when I drive it to the Ford garage it doesn't do this weird action so they can't fix what's not broken... is there some bypass regulator or something that has failed or what?? Hate these sort of random problems and worried that one day it won't "catch" pressure at all and I'll be stuck somewhere. Any help would be greatly appreciated.
Debbie
 
S

speedytang

Founding Member
Jul 28, 1999
765
1
17
Marengo,Ohio,US
Jun 7, 2007
#2
  • Jun 7, 2007
  • #2
Sounds like the Fuel Pressure Regulator. Take the vacuum hose off and see if you smell gas in the line and try to start with the hose off and see if it pressurizes.
 

cjones

Founding Member
Jul 20, 2002
1,561
0
37
Avondale, AZ
Jun 7, 2007
#3
  • Jun 7, 2007
  • #3
try clamping off the return hose and see if it will pressurize. if so, then the pressure regulator is bad.

the fuel pump is suppose to shut off after 2 seconds if the engine isn't cranking.
 

93tealcobra

New Member
Jun 7, 2007
9
0
1
Jun 7, 2007
#4
  • Jun 7, 2007
  • #4
Tank is not the issue. Fuel cap, na. I have to agree with a bleed back through the fuel pressure regulator. They are cheap and fairly easy to change.

CB
 
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