Low fuel pressure
01-16-2013, 01:05 PM
#1
Low fuel pressure
the other day I filled up with gas and on the way home the car started hesitating and eventually stalled. I manged to limp home with a series of start/stalls up to 30mph...fuel pressure was 53psi measured with the aeromotive adapter from BHR (normally I run 59psi)
I have swapped the pump assembly with a used one, that didn't resolve the issue, so I removed the purge solenoid following the FSM and that didn't do anything either. The fuel pressure seems to hold just fine...after >5 minutes it only dropped to 48psi (limit is 29psi)
I swapped the fuel speed relay, the fuel pump relay and the pump resister (which neither of the 2 resisters measured within the .3ohm limit but both cars were known to be working prior to the incident) and none of those seem to be the issue.
when I measure the volts on the plug they do not seem to be correct either so later when my wife gets home we are going to ohm everything else out and go from there.
I would also like to note I had the fuel leak all over the engine block a while back and the cause was never identified. I did replace all the lines and injectors just to be safe.
There is currently no obvious fuel leak just low pressure...need some advice as I am running out of things to look for
I have swapped the pump assembly with a used one, that didn't resolve the issue, so I removed the purge solenoid following the FSM and that didn't do anything either. The fuel pressure seems to hold just fine...after >5 minutes it only dropped to 48psi (limit is 29psi)
I swapped the fuel speed relay, the fuel pump relay and the pump resister (which neither of the 2 resisters measured within the .3ohm limit but both cars were known to be working prior to the incident) and none of those seem to be the issue.
when I measure the volts on the plug they do not seem to be correct either so later when my wife gets home we are going to ohm everything else out and go from there.
I would also like to note I had the fuel leak all over the engine block a while back and the cause was never identified. I did replace all the lines and injectors just to be safe.
There is currently no obvious fuel leak just low pressure...need some advice as I am running out of things to look for
01-18-2013, 10:08 PM
#4
SARX Legend
iTrader: (46)
Yeah he swapped in a working assembly I had. But the assembly I had was sitting on my shelf in a box for a while but I would really surprised if it became messed up just sitting. I'll be over tomorrow to save the day Houston, I think some stuff just needs to be tightened a bit more 
01-19-2013, 02:41 AM
#7
53 psig will not be responsible for the issue, it may not even be a symptom if the gauge or sensor went off slightly
if an injector is sticking it would show up as pressure bleeding off when the fuel pump is turned off, it would not result in 53 psig fuel pressure with the pump running even if it was stuck wide open
if an injector is sticking it would show up as pressure bleeding off when the fuel pump is turned off, it would not result in 53 psig fuel pressure with the pump running even if it was stuck wide open
Last edited by TeamRX8; 01-19-2013 at 02:50 AM.
01-19-2013, 07:41 AM
#9
that is a good thing to consider, my main driving for low pressure is a result of how the gauge reacts when the car is turned on.
after I get some coffee I will post of vid of what the gauge shows. The gauge is a brand new pro sport so I am hoping the gauge is not another issue
after I get some coffee I will post of vid of what the gauge shows. The gauge is a brand new pro sport so I am hoping the gauge is not another issue
01-19-2013, 08:19 AM
#11
Not sure what that is showing....the pump will only run until it primes...and then it shuts off if you don't start the car.
Post one with KOEO and then start it...and it will give us more information
I would expect the FP to read a bit higher..have you checked it with a mechanical guage? The electronic ones are really dependant on grounding and power supply voltage to get correct readings
Post one with KOEO and then start it...and it will give us more information
I would expect the FP to read a bit higher..have you checked it with a mechanical guage? The electronic ones are really dependant on grounding and power supply voltage to get correct readings
01-19-2013, 11:06 AM
#12
the FSM says it should be 54-65 psig pump on-engine off (fuel pump circuit has to be jump wired per the manual to run continuously with engine off), hard to say if your gauge is just off a hair
I was also ***-you-me-ing that it was 53 while running. Please clarify.
but my position is you are likely chasing something that isn't the actual problem
no codes?
.
I was also ***-you-me-ing that it was 53 while running. Please clarify.
but my position is you are likely chasing something that isn't the actual problem
no codes?
.
Last edited by TeamRX8; 01-19-2013 at 11:12 AM.
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