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Thread: High fuel pressure

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Posts: 11-20 of 27
2009-03-07 18:10:04
#11
I'd be very suspect of that return line. I think your idea of compressed air is a good one to clean it out. Never done it though.

Also, make sure you're getting a proper vacuum signal to the FPR.
2009-03-07 18:13:40
#12
Disconnect the return line from the FPR and see if you can blow through it.
2009-03-07 18:16:15
#13
Are you sure you even have high fuel pressure? The gauge says so, but what makes the gauge right? It could very well have gotten damaged.

Based on on that you are getting decent mileage and driveability. I would suspect the gauge some. I wouldn't discount blocked return line, but add gauge to list of suspects.
2009-03-07 18:21:48
#14
Im just throwing this in there... dunno if the car would even function.... but the lines are around the right way when you installed right? The feed goes to the feed on the fuel rail and the return on the return? trying to think if the car would run with the lines backwards though...

Another thought... any of the lines under the car that carries the fuel have some bends in them? The hard lines im talking about here.

Goodluck with finding the problem dude....
2009-03-07 21:14:37
#15
Originally Posted by swiss
Disconnect the return line from the FPR and see if you can blow through it.


I know you suggested that before,but I dont think I have enough lungpower ....doesn't it go all the way to the tank?

Originally Posted by wnwright
Are you sure you even have high fuel pressure? The gauge says so, but what makes the gauge right? It could very well have gotten damaged.

Based on on that you are getting decent mileage and driveability. I would suspect the gauge some. I wouldn't discount blocked return line, but add gauge to list of suspects.


The gauge was working before the swap,and I can turn up the pressure,and it responds

Originally Posted by crackerjack
Im just throwing this in there... dunno if the car would even function.... but the lines are around the right way when you installed right? The feed goes to the feed on the fuel rail and the return on the return? trying to think if the car would run with the lines backwards though...

Another thought... any of the lines under the car that carries the fuel have some bends in them? The hard lines im talking about here.

Goodluck with finding the problem dude....


Car wont run with the lines reversed.

Now the hardlines under the car...hmmmm I will have to check that out.
2009-03-07 21:14:58
#16
Interesting thing just happened a few minutes ago.
I started the car,and I let it run for aout 30 seconds.
( I normally wont even try to drive the car until full warm,and the idle is normal)
I was just gonna move the car like 50 fet,so I figured I would just slip the clutch out and move,even though the car was fast idle still.
I touched the gas and it started to stumble and eventually stalled.
After a few miutes,I tried to sart it again,but everytime I even slightly touch the gas it want s to die
WTF
Seems like maybe it so rich that maybe when it is cold,it is too rich to run???Is this likely?

Edit....I was apparently out of gas...DOH
I went for a drive last night,and the car was not on E all the way,and my fuel light didnot come on.I only had 253 miles since fillup.
Just for the hell of it ,I put a gallon of gas from a gascan in it....started right up.

So...I must have a problem with my pickup,in the tank,I am guessing.

Looks like I need to pull the FP out and check all the lines again...aaaarrrrggh
2009-03-07 21:28:01
#17
Originally Posted by eggman
The gauge was working before the swap,and I can turn up the pressure,and it responds


So... And you didn't have this problem before the swap... There is a chance it got damaged during swap.

Responding doesn't mean it is right. Planes have crashed before because pilots trusted an altimeter that was wrong.
2009-03-07 21:29:01
#18
Originally Posted by eggman
Interesting thing just happened a few minutes ago.
I started the car,and I let it run for aout 30 seconds.
( I normally wont even try to drive the car until full warm,and the idle is normal)
I was just gonna move the car like 50 fet,so I figured I would just slip the clutch out and move,even though the car was fast idle still.
I touched the gas and it started to stumble and eventually stalled.
After a few miutes,I tried to sart it again,but everytime I even slightly touch the gas it want s to die
WTF
Seems like maybe it so rich that maybe when it is cold,it is too rich to run???Is this likely?


Could be or a number of other issues.
2009-03-07 22:15:19
#19
Originally Posted by wnwright
Could be or a number of other issues.


A little info would be nice.

It sounds like there was a clog and now something came loose and clogged somewhere else. Even though i dont think it is the gauge, I would borrow a different gauge and see what it sits at when you turn the key on. Just another thing to cross of the list. Maybe put some seafoam in the tank to see if it makes a difference. There could have been some left over "crap" in the tank or lines that also clogged something.
Otherwise i would try cleaning all the lines again including the return. Maybe just disconnect the feed lines and let the pump push some fuel through into a bucket for a little while. Also you could try compressed air but make sure you disconnect both sides so that the junk gets pushed out.
Might not be a bad idea to pull the rail and clean that out with injector cleaner and such. Maybe check the injectors at that point as well.
Definitely something weird, i would assume these two instances are connected some how and there might be one cause. Maybe start with the return line since that seems to be the most likely culprate.
2009-03-07 23:56:37
#20
Originally Posted by squirlz
A little info would be nice.

It sounds like there was a clog and now something came loose and clogged somewhere else. Even though i dont think it is the gauge, I would borrow a different gauge and see what it sits at when you turn the key on. Just another thing to cross of the list. Maybe put some seafoam in the tank to see if it makes a difference. There could have been some left over "crap" in the tank or lines that also clogged something.
Otherwise i would try cleaning all the lines again including the return. Maybe just disconnect the feed lines and let the pump push some fuel through into a bucket for a little while. Also you could try compressed air but make sure you disconnect both sides so that the junk gets pushed out.
Might not be a bad idea to pull the rail and clean that out with injector cleaner and such. Maybe check the injectors at that point as well.
Definitely something weird, i would assume these two instances are connected some how and there might be one cause. Maybe start with the return line since that seems to be the most likely culprate.


The car had a DE in it with a spun bearing,and bad gas.
I disconnected the fuel line at the rail,and after cleaning the tank out,I pumped 3 gallons through it into a bucket,like you recommended.It was nasty for the first gal or so,but then nice and clear.
Then I rehooked it and the car fired right up.(knocking,lol)
I only ran it for a few minutes,shut it off and pulled the motor.
I pulled the running VE out of the donor car and had it in the new car within a week or two.
I have since driven the car at least 3tanks so far.The first tank ,I ran some octane boost,because I had 89 in the tank.
The second tank,I ran some redline fuel system cleaner through it(full bottle)
I have had this high FP ever since,and really no running issues,but it makes me nervous.

I wonder if I can somehow pump fuel through the whole system including the retun,into a bucket?
When I did it before I just pumped fronm the tank to the fuel rail inlet.
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