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Author
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Topic: I GOT IT!! IM A BAT OUTTA HELL```HELP```FUEL PRESSURE PROBLEMS RELAY ????'S
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totalkaos92
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Member # 5750
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posted
 
 
when i hit the gas the fuel pressure drops down to about 22 psi, at high rpms it stays at a certain power band, and will not pull any more.
set up stock bottom end, worked stock heads w/ 1.7 r.r, e-cam, 36's, e.b intake, powerdyne 6psi.
ran w/out s.c belt and still had same prob. set-up orginally came off auto trans, ran fine w/ no fmu, or external pump.
![[Confused]](confused.gif)
think its tha prob jus want 2nd opinion
![[patriot]](graemlins/patriot.gif)
A BUDDY TOLD ME THAT I MIGHT HAVE A PROBLEM W/ A WIDE OPEN FUEL RELAY IN THE FUEL SYSTEM. HE TOLD ME THAT I MIGHT HAVE TO CHANGE A RELAY BEING THAT I DID A 4 CLY CONV. HAVE ANY BODY HEARD OF THIS???
THIS IS A 1990 W/ THE 1 PLUG HARNESS ON IT
OK NOW I HAVE ADDED THE EXTERNAL PUMP, AND I STILL HAVE A PROBLEM W/ LOSSING POWER AT TOP END!! IT HESITATES APPROX. 3500-5500 RPMS. I CAN FEATHER INTO THE GAS AND GET THE CAR TO MOVE, BUT WHEN I STOMP ON IT, IT FALLS ON ITS FACE.....
WAS A PROBLEM WITH THE FUEL ![[Wink]](wink.gif)
![[Whoo Whooooo!]](graemlins/woowoo.gif) ![[burnout]](graemlins/burnout.gif)
[ November 01, 2007, 11:23 PM: Message edited by: totalkaos92 ]
Posts: 2175 | From: the bay area | Registered: Jun 2005
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Cstang5.0
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Member # 4925
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posted
are you using the stock fuel pump and regulator
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88 VERT slow sold
89 coupe stock ; )
02 yukon
05 focus
Posts: 1638 | Registered: Oct 2004
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92stangLX
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Member # 3252
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posted
quote:
Originally posted by totalkaos92:
when i hit the gas the fuel pressure drops down to about 22 psi, at high rpms it stays at a certain power band, and will not pull any more.
set up stock bottom end, worked stock heads w/ 1.7 r.r, e-cam, 36's, e.b intake, powerdyne 6psi.
ran w/out s.c belt and still had same prob. set-up orginally came off auto trans, ran fine w/ no fmu, or external pump.
think its tha prob jus want 2nd opinion
If you are running an external pump then it isn't working. Had the same issue with my car. Get underneath the back of the car and see if you can hear it running.
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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totalkaos92
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Member # 5750
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posted
255lph fuel pump, but no external pump. but like i said it ran fine w/ set-up on an auto trans. will try new pump and external pump and see if thats the prob.
thanks guys
Posts: 2175 | From: the bay area | Registered: Jun 2005
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badazlx
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Member # 4899
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posted
what you can do is pinch off the fuel return line and it should build pressure if it doesnt you need a pump if it does you need a regulator
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03 mach bolt ons/125 shot
Posts: 911 | From: roseville | Registered: Sep 2004
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totalkaos92
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Member # 5750
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posted
quote:
Originally posted by ranger guy:
what you can do is pinch off the fuel return line and it should build pressure if it doesnt you need a pump if it does you need a regulator
IM A FAKE MECHANIC WHICH IS WHICH ON THE FUEL LINES, I KNOW BIG AND LITTLE ![[Big Grin]](biggrin.gif)
Posts: 2175 | From: the bay area | Registered: Jun 2005
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warhorse58gt
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Member # 7702
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posted
quote:
Originally posted by totalkaos92:
quote:
Originally posted by ranger guy:
what you can do is pinch off the fuel return line and it should build pressure if it doesnt you need a pump if it does you need a regulator
IM A FAKE MECHANIC WHICH IS WHICH ON THE FUEL LINES, I KNOW BIG AND LITTLE
the big line is the in coming fuel line, and the small is the return line.
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WOLFPACK RACING
With guns, we are 'citizens'. Without them, we are 'subjects'.
83gt 354ci sbf 9.40 @ 143
77 cobra 2 171ci 97hp of pure fury!
Posts: 4200 | From: 209 | Registered: Jun 2007
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Cstang5.0
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Member # 4925
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posted
how about your fuel reg. is it stock ?
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88 VERT slow sold
89 coupe stock ; )
02 yukon
05 focus
Posts: 1638 | Registered: Oct 2004
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totalkaos92
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Member # 5750
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posted
no its aftermarket, but it was a fuel problem
Posts: 2175 | From: the bay area | Registered: Jun 2005
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racsirx
CAFords OG
Member # 1710
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posted
I had the same problem years ago, with a Ford Motorsport 190 fuel pump, the FMU would spike the fuel pressure to 100psi, which caused the 190 fuel pump to lock up and drop fuel pressure to like 20psi from time to time, thats why I dont like FMUs and I would never use a Ford Motorsport 190 fuel pump.
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88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
13 BMW AH3
17 GT350 #5556
GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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totalkaos92
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Member # 5750
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posted
i jus thank the mustang gods i was able to figure it out with going and spending a ton of money for nothing.
but yeah fuel system is in the works
Posts: 2175 | From: the bay area | Registered: Jun 2005
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getjobdone
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Member # 4666
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posted
what was the fuel issue?
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91 notch ^ blown h/c/i
Posts: 677 | From: east bay,ca | Registered: Jul 2004
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92stangLX
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Member # 3252
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posted
quote:
Originally posted by getjobdone:
what was the fuel issue?
+1
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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totalkaos92
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Member # 5750
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posted
kinked fuel line lines kinked when putting the gas tank up
Posts: 2175 | From: the bay area | Registered: Jun 2005
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