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Fuel pump issue, please help

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Old Nov 27, 2019 | 04:50 PM
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Default Fuel pump issue, please help
So I had an LT4 pump and LT4 injectors installed on my 14 stingray base along with a supercharger, long tube headers and meth injection. It went on the dyno today and it would only get fuel pumping at 70 psi and this thing should be close to 3000 psi. Do you think this was an install error or is the pump defective? Not sure if anyone else was having these problems during their swap but my tuner said they gotta take it apart again to see, I’m so frustrated right now.
Last edited by TLA3282; Nov 27, 2019 at 05:12 PM.
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Old Nov 27, 2019 | 05:19 PM
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Neither. How are you measuring the output of the high pressure fuel pump?
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Old Nov 27, 2019 | 05:28 PM
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Originally Posted by laserdude2215
Neither. How are you measuring the output of the high pressure fuel pump?
my tuner said low side was fine but high pressure pump wasn’t producing the fuel needed to dyno when he strapped it in and it was going into limp mode.
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Old Nov 27, 2019 | 05:58 PM
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If the pump wasnt shimmed properly it might affect the output pressure.
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Old Nov 27, 2019 | 07:09 PM
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If the hpfp was only pumping 70psi the car wouldn't likely run at all. How familiar is the tuner with gen 5 vehicles?
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Old Nov 29, 2019 | 06:58 PM
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Originally Posted by sevinn
If the hpfp was only pumping 70psi the car wouldn't likely run at all. How familiar is the tuner with gen 5 vehicles?
they’ve done a lot of lt1 and lt4 cars, both vettes and Camaros, pretty reputable shop up in CT.
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Old Nov 29, 2019 | 09:26 PM
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Still don't buy only 70psi of output and the car still behaving to any degree. Would love to see the logs.
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Old Dec 2, 2019 | 01:15 PM
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if I recall correctly an lt1 with a stock cam/fuel lobe doesn't require a lashcap. are they able to load the engine at all or is it seeing 70 at idle?
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Old Dec 3, 2019 | 05:44 PM
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Originally Posted by sevinn
Still don't buy only 70psi of output and the car still behaving to any degree. Would love to see the logs.
Yes, my car is @ 300psi at idle on the high side. Not sure how its running @ 70psi.

EDIT: When its cold out I have seen it idle @ 500-600psi even on startup.
Last edited by MCK_Z06; Dec 3, 2019 at 05:47 PM.
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Old Dec 4, 2019 | 07:49 AM
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This is a less likely but it COULD be in the tune... but also what the other people are saying could be true. But you could also get a bigger cam with a bigger fuel lobe
Last edited by Speed Demon 757; Dec 4, 2019 at 07:50 AM.
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