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Top 2GNT Technical Turbo/Nitrous Tech topic #91789
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Subject: "Fuel pressure wont change" Previous topic | Next topic
DarkEclips96Dec-04-05 08:10 AM
Member since May 23rd 2005
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#91789, "Fuel pressure wont change"




          

So im still have problem with my fuel pressure. I hooked up the fuel gauge, and at idle its at 57-59 psi. Went for a drive, it didnt change at all. I took apart my fmu last week and it looked fine, hooked it back up and everything. I did what star turbo told me to do, and pinched the return line from the fmu and that made my fuel pressure go past 100. Wouldnt that mean my fuel pump is workin, its a wallbro by the way and I can still hear the thing whine loud. If I boost I get lean readings on the a/f gauge so I havent been boosting since this happened. What else could it be? Maybe I overlooked something.


2002 WRX
Eclipse RS-T..sold

  
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Replies to this topic
RE: Fuel pressure wont change, Moderatorcs82685, Dec-04-05 08:13 AM, #1
RE: Fuel pressure wont change, DarkEclips96, Dec-04-05 08:14 AM, #2
      RE: Fuel pressure wont change, Moderatorcs82685, Dec-04-05 08:32 AM, #3
           RE: Fuel pressure wont change, boosted60trimrst, Dec-04-05 12:40 PM, #4
                RE: Fuel pressure wont change, DarkEclips96, Dec-04-05 01:14 PM, #5
                     RE: Fuel pressure wont change, boosted60trimrst, Dec-04-05 01:27 PM, #6
                          RE: Fuel pressure wont change, DarkEclips96, Dec-04-05 01:59 PM, #7
                               RE: Fuel pressure wont change, selmerguy2003, Dec-04-05 02:18 PM, #8
                               RE: Fuel pressure wont change, Blizare, Dec-06-05 01:03 PM, #9
                                    RE: Fuel pressure wont change, DarkEclips96, Dec-06-05 01:30 PM, #10
                                         RE: Fuel pressure wont change, rs_smoked_you, Dec-06-05 01:34 PM, #11
                                              RE: Fuel pressure wont change, Moderatorcs82685, Dec-06-05 02:32 PM, #12

Moderatorcs82685Dec-04-05 08:13 AM
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#91790, "RE: Fuel pressure wont change"
In response to Reply # 0
 Dec-04-05 08:15 AM by cs82685



          

maybe a leak in your vac line run to the fmu, is it hooked up directly to your manifold, if not where is it hooked up to?


I contributed to the Wiki!
EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
95 Eclipse GS - parts car
Mods/Profile - http://www.2gnt.com/index.php?d=cs82685

  
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DarkEclips96Dec-04-05 08:14 AM
Member since May 23rd 2005
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#91791, "RE: Fuel pressure wont change"
In response to Reply # 1



          

Originally posted by cs82685
maybe a leak in your vac line run to the fmu, is it hooked up directly to your manifold?


Yea it is, I looked over the line but I will again since I have to go under there anyway today.


2002 WRX
Eclipse RS-T..sold

  
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Moderatorcs82685Dec-04-05 08:32 AM
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#91793, "RE: Fuel pressure wont change"
In response to Reply # 2



          

Originally posted by DarkEclips96
So im still have problem with my fuel pressure. I hooked up the fuel gauge, and at idle its at 57-59 psi. Went for a drive, it didnt change at all. I took apart my fmu last week and it looked fine, hooked it back up and everything. I did what star turbo told me to do, and pinched the return line from the fmu and that made my fuel pressure go past 100. Wouldnt that mean my fuel pump is workin, its a wallbro by the way and I can still hear the thing whine loud. If I boost I get lean readings on the a/f gauge so I havent been boosting since this happened. What else could it be? Maybe I overlooked something.


It doesn't seem like it is your fuel pump and your idle fp if anything is actually a bit on the high side. If the diagphram looked ok and the vac line looks ok, the next thing i would do is double check to make sure that the fmu is hooked up correctly


I contributed to the Wiki!
EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
95 Eclipse GS - parts car
Mods/Profile - http://www.2gnt.com/index.php?d=cs82685

  
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boosted60trimrstDec-04-05 12:40 PM
Member since Sep 10th 2005
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#91795, "RE: Fuel pressure wont change"
In response to Reply # 3



          

when i had the fmu my fp was 57psi at idle so that is about right. the fmu always ran really rich . thats one reason i changed to the sfmu . if it not rising tho you might have hooked it up wrong . it goes stock fpr to the side of fmu then bottom of the fmu to tank .

LED tails : Done for now!
99 eclipse rst
cobalt blue met. paint,star stage 2 upgraded t3/t460trim turbo ceramic coated , polished compressor housing, ,optima yellow top, chrome i/c piping ,front mount ntercooler ,apexi turbo timer . zeitronix wb02 ,faze oil ,boost gauge,egt ,bosch 4x plugs,kyb agx struts, pro kit springs.17''adr venomous rims,Falken azenis ,brembo dilled/slotted rotors ,turbo xs bov ,oil catch can,manual shiftknob,autometer pyrometer egt , vortech sfmu,b&m fuel pressure gauge ,accel 310cc injectors ,gasketmatched and polished intake manifold ,58mm throttle body ,no egr,polished turbonetics wastegate,fuel pump rewire,homade fcd and a lot more .LED reverse lights ,sidemarkers and tails .atx to mtx swap . South bend tz clutch . Tons more
http://imageshack.us>


http://www.2gnt.com/index.php?d=boosted60trimrst
My contribution to the wiki
http://www.2gnt.com/index.php?d=crank%20arm%20spindle%20mod%20to%20fit%20power%20panels

  
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DarkEclips96Dec-04-05 01:14 PM
Member since May 23rd 2005
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#91796, "RE: Fuel pressure wont change"
In response to Reply # 4



          

Originally posted by boosted60trimrst
when i had the fmu my fp was 57psi at idle so that is about right. the fmu always ran really rich . thats one reason i changed to the sfmu . if it not rising tho you might have hooked it up wrong . it goes stock fpr to the side of fmu then bottom of the fmu to tank .


Yep. thats how i have it. It did work and then just seemed to stop one day when it got cold. I dont know if that had anything to do with it. I also seem to run rich.


2002 WRX
Eclipse RS-T..sold

  
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boosted60trimrstDec-04-05 01:27 PM
Member since Sep 10th 2005
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#91797, "RE: Fuel pressure wont change"
In response to Reply # 5



          

maybe the fuel filter or stock fpr went

LED tails : Done for now!
99 eclipse rst
cobalt blue met. paint,star stage 2 upgraded t3/t460trim turbo ceramic coated , polished compressor housing, ,optima yellow top, chrome i/c piping ,front mount ntercooler ,apexi turbo timer . zeitronix wb02 ,faze oil ,boost gauge,egt ,bosch 4x plugs,kyb agx struts, pro kit springs.17''adr venomous rims,Falken azenis ,brembo dilled/slotted rotors ,turbo xs bov ,oil catch can,manual shiftknob,autometer pyrometer egt , vortech sfmu,b&m fuel pressure gauge ,accel 310cc injectors ,gasketmatched and polished intake manifold ,58mm throttle body ,no egr,polished turbonetics wastegate,fuel pump rewire,homade fcd and a lot more .LED reverse lights ,sidemarkers and tails .atx to mtx swap . South bend tz clutch . Tons more
http://imageshack.us>


http://www.2gnt.com/index.php?d=boosted60trimrst
My contribution to the wiki
http://www.2gnt.com/index.php?d=crank%20arm%20spindle%20mod%20to%20fit%20power%20panels

  
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DarkEclips96Dec-04-05 01:59 PM
Member since May 23rd 2005
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#91798, "RE: Fuel pressure wont change"
In response to Reply # 6



          

Fuel filter is also new..sigh. The stock fpr could be tho, I did take it apart once, they known for going bad?


2002 WRX
Eclipse RS-T..sold

  
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selmerguy2003Dec-04-05 02:18 PM
Member since Nov 04th 2005
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#91799, "RE: Fuel pressure wont change"
In response to Reply # 7
 Dec-04-05 02:18 PM by selmerguy2003

          

Originally posted by DarkEclips96
Fuel filter is also new..sigh. The stock fpr could be tho, I did take it apart once, they known for going bad?



i dought it is the stock fpr. your idle fp is still good. sounds your not getting vac/pressure to your fmu. of your fmu just went bad. good time to go with a sfmu setup imo. or megasquirt

  
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BlizareDec-06-05 01:03 PM
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#91869, "RE: Fuel pressure wont change"
In response to Reply # 7



          

Originally posted by DarkEclips96
Fuel filter is also new..sigh. The stock fpr could be tho, I did take it apart once, they known for going bad?


Okay, why do you have a stock fpr running with the fmu? Unless 96+ is different? emoji


I eat emo kids for breakfast

1995 Eagle Talon (SOLD)
72' SuperBeetle
72' Standard Beetle
56' Deluxe Beetle

  
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DarkEclips96Dec-06-05 01:30 PM
Member since May 23rd 2005
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#91870, "RE: Fuel pressure wont change"
In response to Reply # 9



          

I believe everyone with 96+ with fmu keeps stock fpr. Only when u go to sfmu, do you take it out.

Question, could the rubber vacuum line for fmu be expanded, therefore not raising the fuel pressure in boost. Im still trying to firugre this out.


2002 WRX
Eclipse RS-T..sold

  
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rs_smoked_youDec-06-05 01:34 PM
Member since Nov 14th 2005
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#91872, "RE: Fuel pressure wont change"
In response to Reply # 10

          

Originally posted by DarkEclips96
I believe everyone with 96+ with fmu keeps stock fpr. Only when u go to sfmu, do you take it out. Question, could the rubber vacuum line for fmu be expanded, therefore not raising the fuel pressure in boost. Im still trying to firugre this out.


thats wat i thought

  
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Moderatorcs82685Dec-06-05 02:32 PM
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#91873, "RE: Fuel pressure wont change"
In response to Reply # 11
 Dec-06-05 02:41 PM by cs82685



          

Originally posted by rs_smoked_you
Originally posted by DarkEclips96 I believe everyone with 96+ with fmu keeps stock fpr. Only when u go to sfmu, do you take it out. Question, could the rubber vacuum line for fmu be expanded, therefore not raising the fuel pressure in boost. Im still trying to firugre this out.
thats wat i thought


correct


I contributed to the Wiki!
EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
95 Eclipse GS - parts car
Mods/Profile - http://www.2gnt.com/index.php?d=cs82685

  
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