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No Fuel Pressure.. need help!

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skatershawn

skatershawn

10+ Year Contributor
1,271
12
Feb 27, 2009
Austin, Texas
Ok.. Im still not getting fuel pressure, need up to figure out what the issue is!

heres some info:

Ive got a NEW walbro 255.
Got A Fuel Lab AFRP
Fuel pump was Regrounded!
replaced fuel filter. (twice.. ill get to that in the story!)

ok story goes like so... did a complete rebuild and swaped the 6 bolt into a 93 DL
so i tried to start it.. it sounded as if it was trying to... it started with starting fluid, and i was told to replace the fuel filter... so i did... the car then started for about 10-15 secs and then slowly died! but still no fuel pressure that i noticed on my gauge. so i talked to a few people and they told me since i didnt clean the fuel lines as it sat for almost 2 years. there was propable settlement in the lines that quickly clogged the filter.. so then replaced the fuel filter again just a few mins ago and NO Start, and STILL NO Fuel Pressure!!

I unhooked the fuel line under the filter and cranked it and it spit out fuel like a pressure hose!!
I took the hose from the top of the filter to the line off and its as clean as a whisle!

I have NO CLUE whatelse to Do!!
CAN Some one please help!!


thanks!
 
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what's your fuel pressure regulator set at. If it's backed off all the way, which might be the way Fuel lab sends them so you don't try and start with the wrong setting. When I installed my AFPR, I had mine backed out to be safe and I couldn't get the thing to run either. Try turning the adjustment up and see what happens.
 
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Jump the pump at the connector to make it run all the time. Turn the screw down on your FPR until you see fuel pressure on the gauge.
 
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ok i just found out (not that this would cause no fuel pressure) the dude that rebuilt my motor Reused the injectors off my DL... didn't even let me know, asked him about it and said cause he could find my orings

found them now and said i can go pick them up off him!
:/
OOK? haha well
 
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Yeah, ground it to the battery. If you can hear the pump running (since it's a walbro, you probably will), that's a good thing.

There is a really slim chance that it fell out of the sending unit though and that's why you can't build any pressure. I have seen this happen once before.
 
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skatershawn said:
How do i use that jumper... its the one right behind the battery right? do i just ground it to the battery?
Click to expand...

misphit said:
Yeah, ground it to the battery.
Click to expand...

Last time I looked you connect the fuel pump check connector to the battery positive terminal not the ground to turn the pump on.
 
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steve said:
Last time I looked you connect the fuel pump check connector to the battery positive terminal not the ground to turn the pump on.
Click to expand...

:coy: Sorry, I guess I was more intent on writing what I had to say and answered his question without thinking.
 
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You said the pump was "re-grounded", do you mean the pump has been rewired. Check the relay and make sure you have the terminals connected in the correct sequence.

1G Fuel Pump Rewire
 
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LKWTSI said:
You said the pump was "re-grounded", do you mean the pump has been rewired. Check the relay and make sure you have the terminals connected in the correct sequence.

1G Fuel Pump Rewire
Click to expand...

haha no its not rewired i know... thanks for the nice link, ima need that down the road!

I talked to someone, they had the same issue and they just reran the ground to a nice solid spot and it worked.. so i did so to and it worked!

but that didn't solve my whole issue and im stumped man!
Im getting frustrated, i have no clue what else to check!

i took the fuel rail off and cleaned it out, altho there was thing build up in it! i took the feed line off and sprayed carb cleaner in it!

the only other thing i could think of is the dude that rebuild my car took the DL injectors and swapped them in! (With out notifying me)
and kept my 450's!

talked to him yesterday about it, he said he couldnt find my orings for it, but now found them and i can pick them up when ever!
But even that... why would there be no fuel pressure?
 
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skatershawn said:
But even that... why would there be no fuel pressure?
Click to expand...

Pressure is created by restricting the flow from the pump. For you to have pressure at the regulator there need to be minimal restrictions or leaks before it.

You seem to have fixed the pump running. You need to check the pump to make sure it isn't leaking when it joins the fuel line and make sure that the pickup sock isn't clogged.

You need to make sure the fuel line running forward isn't plugged and that the fuel filter is clean. That just leaves the hose to the rail and the rail. Somewhere along that part your going to find the problem.

Since you seem to have flow at the bottom of the filter you might want to work backward from the regulator and see where the flow stops. Then look at the pump because it's not uncommon for the O-ring and fitting on the Walbro to not seal and without the seal you could get flow when there is no pressure but leak at the pump when you try to make pressure.
 
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Just a thought, but I noticed you said the car sat for 2 years!!! I know you have checked and double checked, BUT you aren't trying to start this thing with 2 year old gas are you??

If you are getting flow to the points you said, and it'll run when you spray some starting fluid into it, I would start to think about the quality of the gas.

Sometimes the simplest things get us all wrapped up. Try draining the tank and putting fresh gas into the system and run it with some good fuel injector cleaner and see if that helps.
 
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LKWTSI said:
Just a thought, but I noticed you said the car sat for 2 years!!! I know you have checked and double checked, BUT you aren't trying to start this thing with 2 year old gas are you??

If you are getting flow to the points you said, and it'll run when you spray some starting fluid into it, I would start to think about the quality of the gas.

Sometimes the simplest things get us all wrapped up. Try draining the tank and putting fresh gas into the system and run it with some good fuel injector cleaner and see if that helps.
Click to expand...

Ya i know... i dumped all the oil gas and cleaned the tank as good as i could.
Put V-power... 5gallons actually! so i know my pump is submerged in some good clean gas!

and i haven't said this yet, but i thank everyone for they help, weather it helps or not! Its all appreciated!
 
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I guess it's time to start looking at something else.. Don't take this the wrong way and I'm not questioning yours or any of your friends technical abilities when I ask my questions, it's sometimes easier to question the obvious than assume the oblivious.

SO if poss', can you post a picture of the fuel rail and lines to it and from it including the filter and AFPR.

I know this sounds stupid, but, I'm suspecting something with your AFPR and the fuel lines to and from it.

So unless your are 100% sure, go ahead and let us have a look.:D
 
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i got a virus on my laptop last week.. every since it hasnt worked right, missing alot of drivers and software! Soooo i currently cant upload photos till i upgrade and install alot of those missing drivers!

JUST so you know it might take some time to get them uploaded!
 
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skatershawn said:
i got a virus on my laptop last week.. every since it hasnt worked right, missing alot of drivers and software! Soooo i currently cant upload photos till i upgrade and install alot of those missing drivers!

JUST so you know it might take some time to get them uploaded!
Click to expand...

Sorry to hear that. No worries, mate. I'll try and up load a pic' of mine later and see if yours looks the same. Same fix, just a different way of getting the info to you.:thumb:
 
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Here's mine. comes out of the fuel rail to the AFPR and then to the return line to the tank.

I assume yours is the same?
 

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oh..oh oh yaaaa of course!!

I have reason to believe i got a defective AFPR... i bought it brand spanking new off some one... everything was still bagged and box, tap and all!!!

BUT thats the last thing i wanted to think of that could have been bad... SOO
i put the old one on just to check and took two cranks but started right up.
starts everytime...
so i got it started and was excited and let it warm up then i drove off about a half a block then turned about to pull into my drive way and get it off the street and...... GOT PULLED OVER.... IN FRONT OF MY HOUSE!!!!

I have NO tags on the car, NO Insurance, And No inspection!!!!

The cop wasn't a COMPLETE DICK... but he gave me a ticket for no tags!!
IN FRONT OF MY HOUSE!!! What a bounce of bull!!

but im also concerned cause it was smoking quite alot... i know its normal for a rebuilt motor to smoke but not suer how much....
and it is also making some tinking, tacking noise... SCARING the baajeeberzz out of me!!
 
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:sosad:
At least you've figured out the prob'. Sucks about the ticket though.
 
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oh and another thing... my tach wasnt working the 500 feet i drove before getting tagged by the cops!!
What could this be!

AND also how do i tell if my seals went out in my turbo??
I don't want to think of that but there was two small drips of coolent under the turbo, but the turbo has absolutely NO shaft play, in, out or side to side!!!

that is THE worst thing i want to hear right now cause i just started it and i just want to feel the beauty of boost again!!!!! :( haha
but ill try to stay positive here!
 
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Figures.

The tach signal doesn't come from the trans. That would be for the speedometer.
The tach signal comes from the coil pack on a 90 and from the power transistor on a 91+. There is also a noise filter that the tach signal runs through before it gets to the gauge on a 90 engine that doesn't exist on the later cars.

The more of the 90 specific parts you can get rid of the happier you will be in the long run.
 
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