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Old 04-16-2013, 04:49 PM   #1
Andor
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Default Car cutting fuel at high rpms (NEED HELP!!!)

Took the car to get tuned today, there was a problem with fuel. On the dyno, the car starts to pull hard till about 5800rpm and then it leans out hard and fuel just cuts out! My tuner says that it could be the fuel pump. I do have a walboro 255 that was put in about 2 years ago, 18k miles on it.

Was told to check it out and see if there is a pinch in the line or if the pump went bad, does Anyone have any input on this?

Also, when cruising on the highway in 6th gear at 3k rpm going around 7mph, the car starts to bog out. And this is only in cruising. If I give it more gas, car goes np but when just cruising at a constant velocity, no acceleration, it almost feels as fuel is getting cut out. What could this be? Injectors???

Please post up as I'm getting the car ready for a big turbo and need this resolved quick and cheap!

Mods: vigilant street short block, AEM CAI, invidia 3" catless tbe, grimspeed ebcs, walbro 255

Thank you, Andor
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Old 04-16-2013, 04:52 PM   #2
danger1138
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Trouble shoot by swapping out the fuel pump as your tuner suggested. Im almost sure thats the issue.
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Old 04-16-2013, 05:04 PM   #3
Andor
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Originally Posted by danger1138 View Post
Trouble shoot by swapping out the fuel pump as your tuner suggested. Im almost sure thats the issue.
Shame walbro only lasted barely 2 years. Any recommendations to better fuel pumps or just stick to the walbro 255?

Thank you for posting
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Old 04-16-2013, 05:29 PM   #4
danger1138
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Id stick with walbro, sometimes they come defective from factory.. But like u said its been 2 years.
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Old 04-16-2013, 05:38 PM   #5
Andor
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After work gonna check it out and see if there is anything visible. My friend who is a mechanics at a Porsche dealership said it could be the fuel filter
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Old 04-16-2013, 08:37 PM   #6
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100% it's the fuel pump, just had this exact same issue. Lucky my tuner has seen this issue before.
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Old 04-16-2013, 08:40 PM   #7
Andor
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I'm gonna take my fuel pump out tonight, is there anything specifically I should be looking for?
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Old 04-16-2013, 08:44 PM   #8
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Originally Posted by Andor View Post
I'm gonna take my fuel pump out tonight, is there anything specifically I should be looking for?
Really the only way to know would be to swap in a know working pump.
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Old 04-16-2013, 08:47 PM   #9
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Make sure there is nothing clogging the pump also.
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Old 04-16-2013, 08:55 PM   #10
Andor
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Thank you, will check tn if there is anything blocking the flow etc and the fuel filter, of not, I'll have to purchase a new fuel pump
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Old 04-17-2013, 10:16 AM   #11
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So pulled everything out last night and everything looked good, tighten up the clamps and just touched around, no visible evidence of anything.

Car now hasn't broken up on the low end (1-3rd gear) so idk if just by taking it out fixed the situation. I dont want to get the car back on the dyno thinking its fixed then it be broken still. But i also dont want to order a new fuel pump and have this fuel pump running perfect.

In a pickle here
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Old 04-17-2013, 10:50 AM   #12
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Just did a lot of research and i believe i found the problem. It sounds like its the fuel filter!

http://www.iwsti.com/forums/2-5-lite...-run-lean.html

is a thread of the car leaning out exactly like mine at higher rpms due to a dirty fuel filter. My fuel filter has never been changed and car is reaching close to 59k miles
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Old 04-25-2013, 11:01 AM   #13
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So i changed the fuel filter last night, went for a cruise on the highway, still was cutting up! WTF can it bee!?
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Old 04-25-2013, 11:31 AM   #14
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Dirty filter!!! Wished this solved my problem!




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Old 04-25-2013, 12:11 PM   #15
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Could it be that there is too much oil in the car? Or is it definitely fuel pump issue??
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Old 04-25-2013, 12:21 PM   #16
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Quote:
Originally Posted by CypherAZ View Post
Really the only way to know would be to swap in a know working pump.
Install fuel pressure gauge

Monitor fuel pressure

Change fuel filter to eliminate that possibility

Know for sure if its a fuel pump issue or not.
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Old 04-26-2013, 07:27 PM   #17
Andor
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took a little oil out of it today as it was sitting a little over the F on the dipt-stick when the car was cold.

My major concern is that the car never smokes or blows oil out of the exhaust any other time then the first time its turned on after 7+ hrs of sitting!

Its not straight oil, looks like oil with some water!?



Also, had the car on stands and let it run when i was under the car for about 5 min and around the heat shield that covers i believe the up-pipe, smoke started to come out of it. Very little, as if oil was maybe burning out of it. And on the heat-shield, there seams to be a little oil.



WTF could it be causing my car to run lean at higher rpms on 4-6th gear and when cruising, it just cuts out?!?!

Last edited by Andor; 04-26-2013 at 07:46 PM.
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Old 04-26-2013, 08:30 PM   #18
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Your blowing smoke on start ups after the car sits for a period of time becuase your valve seals are shot, my buddy's car did the same exact thing. He replaced his seals and no more smoke on start up.
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Old 04-26-2013, 09:11 PM   #19
Andor
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Quote:
Originally Posted by Pfeiff View Post
Your blowing smoke on start ups after the car sits for a period of time becuase your valve seals are shot, my buddy's car did the same exact thing. He replaced his seals and no more smoke on start up.
When I had the block off, got the heads cleaned and all valves inspected and was told they were good?!??
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Old 04-26-2013, 10:40 PM   #20
nmlittlebigman
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Quote:
Originally Posted by CypherAZ View Post
Really the only way to know would be to swap in a know working pump.
Quote:
Originally Posted by kellygnsd View Post
Install fuel pressure gauge

Monitor fuel pressure

Change fuel filter to eliminate that possibility

Know for sure if its a fuel pump issue or not.

+1 ^^^ you have been given two options. pick one.
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Old 04-26-2013, 10:53 PM   #21
Pfeiff
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You might have been told that your valves were good but your symptoms scream bad valve seals, just trying to help buddy
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