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Fueling problem.. won't run without some rigging.

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Old Mar 24, 2009 | 06:25 PM
  #1  
FIRECHICKEN's Avatar
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From: Mechanicsburg, PA
Car: '89 Formula 350
Engine: 5.7L L98 TPI
Transmission: 700-R4 Automatic
Axle/Gears: 7.5 disc posi 3.23
Fueling problem.. won't run without some rigging.

Alright so... I was pressure washin the engine bay awhile back. Afterwards I went to start the car and no joy.. I hooked up the fuel pressure gauge and it barely moved the needle when cranking. Fuel comes out of the test port but only slowly. I can get the car to run but only if I full throttle the TPS sensor and prime the engine with either gas or ether. After I get it to idle with feeding it gas it will run on it's own at a high idle. Still no visible change in fuel pressure. So??? Did I get something wet? Why would the pressure be almost nothing but enough to still run the engine??

Hmmm.... Thanks

The Car is a 1992 Trans am. 5.0 Speed density. Pretty much all stock.

Last edited by FIRECHICKEN; Mar 24, 2009 at 06:27 PM. Reason: Car clarification
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Old Mar 24, 2009 | 06:50 PM
  #2  
driver101's Avatar
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From: edmonton alberta canada
Car: 91 rs,1 92 rs,92 b4c/1le
Engine: 5.0tbi,5.7 tune port/5.0tpi
Transmission: 5spdx2 and t56
Axle/Gears: 3.08,3.73,3.42
Re: Fueling problem.. won't run without some rigging.

check the fuel pump fuse its in the engine compartment it think its by the rh headlamp not sure on fb
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Old Mar 25, 2009 | 06:53 PM
  #3  
FIRECHICKEN's Avatar
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From: Mechanicsburg, PA
Car: '89 Formula 350
Engine: 5.7L L98 TPI
Transmission: 700-R4 Automatic
Axle/Gears: 7.5 disc posi 3.23
Re: Fueling problem.. won't run without some rigging.

Alrighty... I did some checking. It is not the fuse or the relay. I jumped the relay and I can hear the pump kick on. I still have no pressure at the rail. So either the pump can't manage to put up enough pressure and it's fried. Or the line is clogged somewhere, maybe the filter. I don't think it would one day run fine and the next not if it was a clog??
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Old Apr 5, 2009 | 01:54 PM
  #4  
FIRECHICKEN's Avatar
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Joined: Jul 1999
Posts: 816
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From: Mechanicsburg, PA
Car: '89 Formula 350
Engine: 5.7L L98 TPI
Transmission: 700-R4 Automatic
Axle/Gears: 7.5 disc posi 3.23
Re: Fueling problem.. won't run without some rigging.

One last post before I rip out the tank and replace the pump. I replaced the fuel filter and tried that.. NOPE... I then check voltage at the tank. 12V... I then clamped the return line to see if it was the pressure regulator.. Still no pressure. I do have flow still but barely enough to fill a 20oz bottle in a couple minutes. So??????? Anybody have any last minute ideas?????

Thanks
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