Is there a way to determine if its the check valve or injectors leaking?
My pressure drops almost instantly after the pump primes.
My pressure drops almost instantly after the pump primes.
injectors or fuel pump check valve?
Plug ugly2
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so capped the return line, and I have pressure finally. Its slowly leaking off, so not sure if an injector isnt leaking somewhere or its just the cap, but clearly the the BBK FPR is not holding pressure. It sounds like it never, and as stated above, only got worse with a larger pump.
SOOO, now the question, is it really a problem and is it the cause of my hard starting? If replacement needs to occur, is Kirban the best option or is there something else out there?
SOOO, now the question, is it really a problem and is it the cause of my hard starting? If replacement needs to occur, is Kirban the best option or is there something else out there?
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3,587 Posts
If you cap the return line & it still leaks down, it indicates the fuel pump has no check valve. Mine leaks down slowly over several hours, with the old fuel pump, it would hold for 24 hrs. You only need some pressure so it won't "vapor lock" (a carburetor term, but applicable here).
Kirban has been in the business for a long time.
Kirban Performance
Click on the "About Us" tab.
You may not know, but the Mustang Fox bodies & the Buick Grand National turbos did a lot of head to head racing, about 20 years ago.
Kirban FPR's were the preferred among the "old timers", before the days of ECU tuning.
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181 Posts
put the kirban in, and pressure drops fast to about 20, and then slowly bled down over an hour or so. Not sure why it would drop so far so fast. Im really at a loss, and trying to figure out this dang hard start. Havent tried to start it with new FPR (cooling system is torn apart)
Is there a way to test the injectors?
Is there a way to test the injectors?
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3,587 Posts
Works just like mine.
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Hey Damon,
You know I can kick up the crank pw for the first .25 seconds of crank to compensate for the loss of pressure right?
btw, I posted an updated tune for you about a month ago, I just looked and I seen you hadn't downloaded it yet
EFIDynoTuning • Login
You know I can kick up the crank pw for the first .25 seconds of crank to compensate for the loss of pressure right?
btw, I posted an updated tune for you about a month ago, I just looked and I seen you hadn't downloaded it yet
EFIDynoTuning • Login
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Mine drops right away to almost nothing with a Aeromotive setup, and always has. My car starts fine all the time, pressure drop after prime or not.
As soon as the engine rolls and the PIP starts, the pump restarts and pressure is right back. I don't know why you would have a problem starting with that drop.
As soon as the engine rolls and the PIP starts, the pump restarts and pressure is right back. I don't know why you would have a problem starting with that drop.
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181 Posts
thanks Micheal. Havent tried the tune yet as I had been trying to resolve the fuel and cooling issue. After beating on the rig at high speeds in the dirt the radiator started leaking and needed to be warranted out. Hopefully I can get to it next week.
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