Fueling & Injection Fuel Pumps | Injectors | Rails | Regulators | Tanks

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Old May 10, 2007 | 09:53 AM
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Default No pressure

My car recently started to really slow down in the top end when I would go WOT. It just seems to lag in the upper RPM's, but coming out of the whole it's an animal. I checked the fuel at the "Schrader Valve" and no gas was coming out. The car doesnt seem to be building fuel pressure.. What can this be a symptom of? bad injectors? fuel rails?

-Thanks
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Old May 10, 2007 | 10:12 AM
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you must have checked it after the car was off because if there wasn't any pressure at all, the car wouldn't run. It does relieve pressure when sitting. Now onto your problem.. It could be as simple as a clogged fuel filter. That will restrict flow. The thing you have to look at is: Did the car run right before? Did you change anything since it worked right? If the filter doesn't cure the fuel delivery problem (assuming that's what it is) it's a good idea to replace them anyway. Next would be looking into a bap. First, spend a couple bucks (like $40 on ebay) and get an electric fuel pressure gauge. Then you'll be chasing the right problem. There was a guy on here last week that claimed his car "hit a wall" (look for the thread) and was sure it was fuel delivery, all it was.. one injector wire that had broke loose.
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Old May 10, 2007 | 05:13 PM
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Yea, the car is was off when I checked it, but any other LS1 should release some fuel when sitting, and mine isn't. I've swapped the fuel filter already too...
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