Fuel problem with a ls swap please help

[Bulldog88]

Im having a issue with keeping fuel at the rail, im using a fuel cell thats vented, aeromotive regulator, walbro pump, the pump turn on everytime I turn the key but I have floor the gas pedal for it to start up other wise the engine wont fire up is has a ls1 intake with the built in regulator on it, is it possible that the regulator on the on the intake has gone bad and doesnt hold fuel pressure?
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[ls1nova71]

You have a 97-98 Corvette fuel rail with both feed and return lines? That's the only LS1 fuel rail that has a built in regulator. Camaros with returnless rails dont have a regulator, just a pulsator. Have you verified that it isn't holding pressure with a gauge? Usually having to floor the pedal to get it to start means you're getting too much fuel and flooring it puts it in clear flood mode.
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[Bulldog88]

I have the Ls1 intake that came from a camaro, which only has a feed my return is at the regulator
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[joesgreen67]

Originally Posted by ls1nova71

Have you verified that it isn't holding pressure with a gauge?Posted via Mobile Device

^^^^^^ Exactly what I was thinking! You really need to check your fuel pressure before you try to diagnose.

[Bulldog88]

Is t possible that its doing ths because the o2 sensors are not installed yet in the exhaust , the fuel regulator is brand new and set at 60psi
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[joesgreen67]

Originally Posted by Bulldog88

Is t possible that its doing ths because the o2 sensors are not installed yet in the exhaust , the fuel regulator is brand new and set at 60psi
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No, I ran mine without o2 sensors hooked up (until I got to the muffler shop).
Even though you have a new fuel reg. you REALLY need to check your fuel pressure at the RAIL.

How are you determining fuel pressure?

Your prob. gonna find you do not have enough pressure. I know your saying the regulator is new BUT ......I had both o2 sensors that had a problem right out of the box! I bought Denso brand o2 sensors and my CEL hasnt come on since.

Just because it's new doesnt mean its good.