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Low fuel pressure. Relay maybe going???

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Old Nov 17, 2001 | 01:45 AM
  #1  
TPortFormula's Avatar
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Joined: Sep 2001
Posts: 95
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From: Richmond, VA
Car: 1991 Pontiac Firebird Formula
Engine: 305 TPI
Transmission: a crappie 700-R4
Low fuel pressure. Relay maybe going???

All of a sudden, my car started to bog out, idle funny, and have a hard time starting. I checked my fuel pressure, and it was extremely low, likeat about 28 to 30. I tried turning up the pressure all the way (have adj. pres. reg.) and the pressure didn't even change. do you think my relay is going bad, or maybe would it be something in my fuel lines or what. Please help!!!!!!
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Old Nov 17, 2001 | 02:38 AM
  #2  
Engineboy's Avatar
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Joined: Dec 1999
Posts: 1,237
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From: Reno, NV
Car: yep
Engine: uhuh
Transmission: sure does
Try a fuel filter first.

------------------
ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...

R.I.P. #3
"He can see air"
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Old Nov 17, 2001 | 03:02 AM
  #3  
86TpiTransAm's Avatar
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Joined: Dec 2000
Posts: 1,536
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From: Springfield, MO, USA
Car: 1986 Trans Am, 1991 Firebird
Engine: 355 TPI, 3.1L V6
Transmission: 700R4 in both
<font face="Verdana, Arial" size="2">Originally posted by Engineboy:
Try a fuel filter first.

</font>

Try the filter and then check out the regulator.


------------------
1986 Trans AM
355 TPI
4 Wheel Disc Brakes
9 bolt Borg Warner Rear (2.77's....oh joy) :P
6" rods, approx. 9.7:1 Compression, Stock TPI (soon to be ported), 24#/hr LTI injectors (cleaned and flowmatched by Cruizin Performance), Hedman Shorty Headers, 3" exhaust with 80 series flowmaster, SBC 993 heads completely redone and modified for 1.6 RR, 1.52 RR (for now), Comp Cams XE262-14 TPI Cam, Holley AFPR, TPIS airfoil, MSD wires, MSD 6-AL Ignition, Hypertech 53,000 volt coil.

Track times to come.
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Old Nov 17, 2001 | 05:48 AM
  #4  
Jza's Avatar
Jza
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Joined: Jul 1999
Posts: 4,384
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From: Tulsa, OK
A bad fuel pump relay is not going to give you "low fuel pressure". If the relay's going, the oil pressure switch will still run the pump as long as there's oil pressure (engine is running).
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Old Nov 17, 2001 | 10:17 PM
  #5  
TPortFormula's Avatar
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Joined: Sep 2001
Posts: 95
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From: Richmond, VA
Car: 1991 Pontiac Firebird Formula
Engine: 305 TPI
Transmission: a crappie 700-R4
I think there's a bad connection in the wire harness (did a splice to lengthen the wires to get to the oil pressure switch), and i had already replaced the switch, but the gauge in the car reads high oil pressure. the gauge shoots up to the max before the car starts, and i figure, if there's a bad connection to oil pressure switch, maybe its causing the fuel pump to go a little weird. would this be a possibility? Also, do you think a bad connection would cause the fuel relay to get hot, or is that normal?
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