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Author
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Topic: Fuel Pressure?
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OneBadHatch
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Member # 970
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posted
 
 
what should my fuel pressure be at all points of the throttle such as idle cruising and wide open? i have 24 lb injectors with a 255lph pump for a 302 with trick flow intake and cam and afr heads, with bbk longtubes... thanks!
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1990 GT
TFS Intake and Cam
AFR 165's
Plus all the goodies
Posts: 834 | From: Oceanside, CA | Registered: Mar 2002
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Pure Stang
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Member # 7251
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posted
lets see... stock is 39.... i would put it at about 43-45
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HEART BREAKER
R.I.P Willie Guzman (5ltrsvt) you will be missed brother.
04/24/87 - 11/23/2012
90 lx 347 RIP
86 gt
89 lx- next project
Posts: 6497 | From: San Jose | Registered: Nov 2006
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OneBadHatch
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Member # 970
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posted
what should it be at at wide open throttle...should it stay the same?
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1990 GT
TFS Intake and Cam
AFR 165's
Plus all the goodies
Posts: 834 | From: Oceanside, CA | Registered: Mar 2002
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rickm347
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Member # 5323
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posted
stock with key on engine off is 30 psi, key on engine running is 35 psi. you can bump it up to 43-45, but in my opinion put it at what pure stang said and stand behind your car with the car on and see how bad your eyes burn after a few seconds.
*Im not sayin what pure stang said is wrong, but i would put it no more than 40 psi. Also, at wide open throttle, the fuel pressure should be the same as it is when the car is at idle --rick
Posts: 936 | From: Chico | Registered: Feb 2005
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OneBadHatch
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Member # 970
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posted
what could cause my fuel pressure to drop? When i put it to the floor it drops down about 7-8 psi and then goes down a little more and stops
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1990 GT
TFS Intake and Cam
AFR 165's
Plus all the goodies
Posts: 834 | From: Oceanside, CA | Registered: Mar 2002
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925GT50
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Member # 2683
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posted
quote:
Originally posted by OneBadHatch:
what could cause my fuel pressure to drop? When i put it to the floor it drops down about 7-8 psi and then goes down a little more and stops
Fuel pressure regulatror bad???
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1990 GT hatch (owned since 05')
1988 GT (sold)
1995 SN95 Cobra (totaled/parted)
1995 Pontiac Firebird Trans Am LT1 (daily driver)
Posts: 2443 | From: 925 | Registered: Apr 2003
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OneBadHatch
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Member # 970
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posted
well its almost new but...its a kirban i didnt even know those could go bad
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1990 GT
TFS Intake and Cam
AFR 165's
Plus all the goodies
Posts: 834 | From: Oceanside, CA | Registered: Mar 2002
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rickm347
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Member # 5323
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posted
how old is the fuel pump?? Where is your fuel pressure gauge located at?? like is the gauge on the shrader (not sure how to spell that one) or is it going through a line then to a gauge??
Posts: 936 | From: Chico | Registered: Feb 2005
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OneBadHatch
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Member # 970
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posted
schrader
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1990 GT
TFS Intake and Cam
AFR 165's
Plus all the goodies
Posts: 834 | From: Oceanside, CA | Registered: Mar 2002
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Pure Stang
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Member # 7251
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posted
quote:
Originally posted by rickm347:
stock with key on engine off is 30 psi, key on engine running is 35 psi. you can bump it up to 43-45, but in my opinion put it at what pure stang said and stand behind your car with the car on and see how bad your eyes burn after a few seconds.
*Im not sayin what pure stang said is wrong, but i would put it no more than 40 psi. Also, at wide open throttle, the fuel pressure should be the same as it is when the car is at idle --rick
+1 thats what i do stand behind the car and smell it ou can tell if it gets to rich... and try not to get high off the fumes ![[patriot]](graemlins/patriot.gif)
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HEART BREAKER
R.I.P Willie Guzman (5ltrsvt) you will be missed brother.
04/24/87 - 11/23/2012
90 lx 347 RIP
86 gt
89 lx- next project
Posts: 6497 | From: San Jose | Registered: Nov 2006
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rickm347
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Member # 5323
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posted
[/qb][/QUOTE]+1 thats what i do stand behind the car and smell it you can tell if it gets too rich... and try not to get high off the fumes [/QB][/QUOTE]
![[Big Grin]](biggrin.gif) nice. . . .
so is the fuel pressure gauge right on the schrader valve or is it externally mounted like through a line?? --rick
Posts: 936 | From: Chico | Registered: Feb 2005
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1988Stang
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Member # 6280
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posted
The vacuum from the motor kicks the pressure down when you first hit the throttle, then it should come back up as the motor needs the fuel.
Posts: 161 | From: Petaluma | Registered: Dec 2005
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nine
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Member # 6732
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posted
I'm pretty sure the pressure should acutally go UP at WOT.
At idle, with the vaccuum line hooked up to the regulator, manifold vaccuum will "pull up" on the regulator. As you go WOT, manifold vaccuum drops to 0 (i.e. relative to atmospheric pressure) and nothing is "pulling up" on the regulator fuel return valve.
When you set FP, you should set it with the vaccuum line off of the regulator and plugged up.
Posts: 40 | Registered: Apr 2006
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