Need help before i give in an take it to the stealership...

bigz5000 · July 6th, 2011, 11:40 PM

Threw two codes, both saying i was running lean. My plugs to the first o2 sensors were hanging so naturally i thought that was the problem. Bought a new one moved it around, no more codes, same problem. So as i am in the car watching the idle, trying to see if it will throw any codes, i notice my fuel pressure gauge is only at 9 psi...WTF.

Has a new 255 lph fuel pump/ filter, and bypassed the Vortech boost a pump about 380 miles ago. was running about 40 psi.

So as i noticed the 9 psi, i cycled the key to see if i can build pressure. No such luck, turn the key on, kick to 9 psi then dropped...several more times, was only kicking to 4 psi then dropping. Started the car several times, and only got to 9 psi. I can here gas pumping through the line, with a new pump i would like to rule it out, but maybe i got a dud from jegs, and im sure they wont warranty it.

Could it by change be the in line fuel pressure regulator..mine is a paxton, its blue, right before the fuel rail?

Could my gauge be wrong? I have a mechanical gauge, but the adapter for the autometer removed the stock schrader valve so i cant hook it up.

I tried to adjust the puel pressure regulator with the allen screw on top, an no movement in the pressure.

I have no f'ing clue and am frustrated.

Any help would be greatly appreciated.

bigz5000 · July 7th, 2011, 09:08 AM

Forgot to mention, it has a new fuel filter, the oil does not smell like gas, and it isnt smoking at all.

4valvegt · July 7th, 2011, 06:53 PM

I have had problems with the 255 in the past it is not uncommon for these pumps to fail

4valvegt · July 7th, 2011, 06:57 PM

one test would be to pinch the return line and see if it builds pressure but being that low it is very likely a pump issue.

rag-top_man · July 8th, 2011, 12:16 AM

I had a new pump fail after 150 miles,replaced it w/another one worked fine(needed transpo so I bought a new one outright and vender said my in tank filter was dirty causing failier looked clean to me!) I guess their way of weaseling out!! new pump from napa has over 5000 miles no problems! never had these problems with the old mechanical pumps and they call it progress?

WabashaCobra99 · July 8th, 2011, 12:35 AM

Could be a failing electrical connection that can't pass enough current. Try tracing back from the fuel pump for any connectors that are loose or have oil dripping on them.

bigz5000 · July 8th, 2011, 10:58 AM

i will check the connections when i am under it tomorrow...Really hope i dont have to drop the tank again, but it is looking that way. Good thing my tank is completely full minus 14 miles of driving..FML

Think Jegs will warranty the pump i just put in?

bigz5000 · July 8th, 2011, 11:01 AM

Not Jegs...Just checked the receipt. Bought it from summit 2/17/11. im sure i will have to eat the cost

4valvegt · July 8th, 2011, 11:33 PM

Summit doesnt have the best customer service lol.

bigz5000 · July 11th, 2011, 11:22 PM

called summit, they say it has a 1 yr warranty, so i ordered a new one, and will return the faulty on for credit.

Postponing the stealership trip till i get the new pump

I noticed that i had pinched the return line between the tank and the frame, so hopefully that is what caused the fuel pump to fail, or blow the seal. It is pumping fine, but the system isnt holding pressure.

I messed with the paxton fuel pressure regulator, could i have messed something up if it was my pump?

majorownage · July 12th, 2011, 03:42 AM

Probably that paxton fuel pressure regulator

get a nice boost referenced pressure regulator and throw that paxton/vortech one in the trash

bigz5000 · July 12th, 2011, 09:54 AM

any recommendations?

CobraStang161 · July 12th, 2011, 11:50 AM

Originally Posted by bigz5000

any recommendations?

Aeromotive A1000

July 6th, 2011, 11:40 PM	#1
bigz5000 Regular 1998 Mustang Cobra Join Date: Apr 2010 Location: Kansas Posts: 111 iTrader: 0 reviews	Need help before i give in an take it to the stealership... Threw two codes, both saying i was running lean. My plugs to the first o2 sensors were hanging so naturally i thought that was the problem. Bought a new one moved it around, no more codes, same problem. So as i am in the car watching the idle, trying to see if it will throw any codes, i notice my fuel pressure gauge is only at 9 psi...WTF. Has a new 255 lph fuel pump/ filter, and bypassed the Vortech boost a pump about 380 miles ago. was running about 40 psi. So as i noticed the 9 psi, i cycled the key to see if i can build pressure. No such luck, turn the key on, kick to 9 psi then dropped...several more times, was only kicking to 4 psi then dropping. Started the car several times, and only got to 9 psi. I can here gas pumping through the line, with a new pump i would like to rule it out, but maybe i got a dud from jegs, and im sure they wont warranty it. Could it by change be the in line fuel pressure regulator..mine is a paxton, its blue, right before the fuel rail? Could my gauge be wrong? I have a mechanical gauge, but the adapter for the autometer removed the stock schrader valve so i cant hook it up. I tried to adjust the puel pressure regulator with the allen screw on top, an no movement in the pressure. I have no f'ing clue and am frustrated. Any help would be greatly appreciated. __________________ MMR Built Short Block, Vortech V1 Supercharger, AIS Methanol Injection, BBK LT's, X Pipe, Flowmasters, Steeda Springs, Tokico Shocks, Spec 2+ Clutch, Tri Ax shifter, 4:10's, SCT Tuner

July 7th, 2011, 09:08 AM	#2
bigz5000 Regular 1998 Mustang Cobra Join Date: Apr 2010 Location: Kansas Posts: 111 iTrader: 0 reviews	Forgot to mention, it has a new fuel filter, the oil does not smell like gas, and it isnt smoking at all. __________________ MMR Built Short Block, Vortech V1 Supercharger, AIS Methanol Injection, BBK LT's, X Pipe, Flowmasters, Steeda Springs, Tokico Shocks, Spec 2+ Clutch, Tri Ax shifter, 4:10's, SCT Tuner

July 7th, 2011, 06:53 PM	#3
4valvegt Enthusiast 03 Cobra Join Date: Oct 2009 Location: Nebraska Posts: 809 iTrader: 1 reviews	I have had problems with the 255 in the past it is not uncommon for these pumps to fail __________________ MM Cobra Club #86 2003 Mineral Grey Cobra 2004 True Blue F-150 FX4

July 7th, 2011, 06:57 PM	#4
4valvegt Enthusiast 03 Cobra Join Date: Oct 2009 Location: Nebraska Posts: 809 iTrader: 1 reviews	one test would be to pinch the return line and see if it builds pressure but being that low it is very likely a pump issue. __________________ MM Cobra Club #86 2003 Mineral Grey Cobra 2004 True Blue F-150 FX4

July 8th, 2011, 12:35 AM	#6
WabashaCobra99 Who needs titles... 1999 Mustang Cobra Join Date: Jun 2010 Location: Plainview, MN Posts: 1,114 iTrader: 0 reviews	Could be a failing electrical connection that can't pass enough current. Try tracing back from the fuel pump for any connectors that are loose or have oil dripping on them. __________________ MM Cobra Club Member #97 Just call me Jon Minnesota! Jon's Sig Collection

July 8th, 2011, 12:16 AM	#5
rag-top_man Newbie 94cobra pace,95gt98cobra Join Date: Apr 2011 Location: arizona Posts: 45 iTrader: 0 reviews	I had a new pump fail after 150 miles,replaced it w/another one worked fine(needed transpo so I bought a new one outright and vender said my in tank filter was dirty causing failier looked clean to me!) I guess their way of weaseling out!! new pump from napa has over 5000 miles no problems! never had these problems with the old mechanical pumps and they call it progress?

July 8th, 2011, 10:58 AM	#7
bigz5000 Regular 1998 Mustang Cobra Join Date: Apr 2010 Location: Kansas Posts: 111 iTrader: 0 reviews	i will check the connections when i am under it tomorrow...Really hope i dont have to drop the tank again, but it is looking that way. Good thing my tank is completely full minus 14 miles of driving..FML Think Jegs will warranty the pump i just put in? __________________ MMR Built Short Block, Vortech V1 Supercharger, AIS Methanol Injection, BBK LT's, X Pipe, Flowmasters, Steeda Springs, Tokico Shocks, Spec 2+ Clutch, Tri Ax shifter, 4:10's, SCT Tuner

July 8th, 2011, 11:01 AM	#8
bigz5000 Regular 1998 Mustang Cobra Join Date: Apr 2010 Location: Kansas Posts: 111 iTrader: 0 reviews	Not Jegs...Just checked the receipt. Bought it from summit 2/17/11. im sure i will have to eat the cost __________________ MMR Built Short Block, Vortech V1 Supercharger, AIS Methanol Injection, BBK LT's, X Pipe, Flowmasters, Steeda Springs, Tokico Shocks, Spec 2+ Clutch, Tri Ax shifter, 4:10's, SCT Tuner

July 8th, 2011, 11:33 PM	#9
4valvegt Enthusiast 03 Cobra Join Date: Oct 2009 Location: Nebraska Posts: 809 iTrader: 1 reviews	Summit doesnt have the best customer service lol. __________________ MM Cobra Club #86 2003 Mineral Grey Cobra 2004 True Blue F-150 FX4

July 11th, 2011, 11:22 PM	#10
bigz5000 Regular 1998 Mustang Cobra Join Date: Apr 2010 Location: Kansas Posts: 111 iTrader: 0 reviews	called summit, they say it has a 1 yr warranty, so i ordered a new one, and will return the faulty on for credit. Postponing the stealership trip till i get the new pump I noticed that i had pinched the return line between the tank and the frame, so hopefully that is what caused the fuel pump to fail, or blow the seal. It is pumping fine, but the system isnt holding pressure. I messed with the paxton fuel pressure regulator, could i have messed something up if it was my pump? __________________ MMR Built Short Block, Vortech V1 Supercharger, AIS Methanol Injection, BBK LT's, X Pipe, Flowmasters, Steeda Springs, Tokico Shocks, Spec 2+ Clutch, Tri Ax shifter, 4:10's, SCT Tuner

July 12th, 2011, 03:42 AM	#11
majorownage Regular Join Date: Jun 2010 Posts: 424 iTrader: 0 reviews	Probably that paxton fuel pressure regulator get a nice boost referenced pressure regulator and throw that paxton/vortech one in the trash __________________ 1998 Gt full pi swap -Dead and gone 1998 Mark VIII 4.30s, 125 shot, 93 d/s-Daily Driver 1998 BAB Cobra-Project

July 12th, 2011, 09:54 AM	#12
bigz5000 Regular 1998 Mustang Cobra Join Date: Apr 2010 Location: Kansas Posts: 111 iTrader: 0 reviews	any recommendations? __________________ MMR Built Short Block, Vortech V1 Supercharger, AIS Methanol Injection, BBK LT's, X Pipe, Flowmasters, Steeda Springs, Tokico Shocks, Spec 2+ Clutch, Tri Ax shifter, 4:10's, SCT Tuner

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