Fuel pump
Thread Starter
Intermediate
Joined: Feb 2019
Posts: 27
Likes: 6
Fuel pump
So I have a boosted c5, and I don’t very much about mechanics or cars so I’m turning the pros here. I’m having to cycle my ignition 5-10 times before the car will start. It’s been tuned and was tested today at the dyno for safety. It makes 526 rwhp. I read on here it could be the fuel filter/regulator, possibly the check valve, and /or the fuel pump(s). My question is what is a good aftermarket pump(s) that will efficiently fuel this car? It makes 9.8 psi, and has a boost pump
Safety Car
Joined: Feb 1999
Posts: 4,043
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From: Central NJ
Do you hear the pump turning on when you turn the key? Can turn to on position without cranking it. Probably not the pump if its cycling....do you have a fuel pressure gauge? Did you get q new fuel pump or BAP when you did the SC install..
Thread Starter
Intermediate
Joined: Feb 2019
Posts: 27
Likes: 6
It primes everytime I turn the key and it holds 50psi at start and around 58psi while driving. I bought the car built professionally here where I live. It’s annoying more than anything but being boosted I want to make sure it doesn’t starve for fuel
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, if it's holding pressure when primed and has been ran to redline on the dyno and holds fuel pressure then your problem is most likely tune related... did you buy it this way or did it start occuring after tuning?... some tuners will do a good wot tune and neglect the startup and driveability tuning
Thread Starter
Intermediate
Joined: Feb 2019
Posts: 27
Likes: 6
I bought this way and had one of our known tuners run the dyno and test for safety. He said it’s a very safe tune. That being said he doesn’t tune many LS cars as he is a mustang guy, but he is incredibly knowledgeable and honest. I have an appointment to change the fuel filter/regulator to see if it helps. Can’t hurt. If that doesn’t fix it, I’m going to take it the most reputable LS tuner I know around here.
Last edited by Sup3rCharg3d99; Feb 23, 2019 at 05:10 PM.
Instructor
Joined: Feb 2002
Posts: 249
Likes: 10
From: Mesa AZ
I have a problem similar to yours. Sometimes have to cycle the pump several times to start the car. I'm thinking check valve or regulator.
What year is your car? My understanding is if it's a late 2003 or 2004, you have to drop the left tank to replace the pump, filter, or regulator, which is
a 8-12 hour labor job.
Please post your results if you get the fuel filter/regulator job done.
Hope it fixes your problem.
What year is your car? My understanding is if it's a late 2003 or 2004, you have to drop the left tank to replace the pump, filter, or regulator, which is
a 8-12 hour labor job.
Please post your results if you get the fuel filter/regulator job done.
Hope it fixes your problem.
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Thread Starter
Intermediate
Joined: Feb 2019
Posts: 27
Likes: 6
Mine is a 1999. I’ve read where the filter/regulator is located on the rear subframe and then some have said it’s in the tank like you suggested. It’s getting done regardless and I will let you know if it fixes it.
Instructor
Joined: Feb 2002
Posts: 249
Likes: 10
From: Mesa AZ
Yes, I've heard the earlier models are easier to service. I had a supercharged 2001 years ago, and never had problems with it. It was built already, properly.
Between the headlight problem I had, and the fuel tanks, that's 2 needlessly overcomplicated systems in this car. Hope I don't find more.
I hope you really enjoy your boosted car when it's running right, I sure did.
Thanks.
Between the headlight problem I had, and the fuel tanks, that's 2 needlessly overcomplicated systems in this car. Hope I don't find more.
I hope you really enjoy your boosted car when it's running right, I sure did.
Thanks.