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TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.

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Old 06-15-2007, 10:54 AM   #1
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Car: 89 IROC-Z
Engine: 383 stroker
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Fuel Pressure too high (80psi)

So i put a new high flow Walbro fuel pump in, but now my AFR doesnt seem to be able to get the pressure below 80psi now. Just put a new bbk pressure regulator on and the screw is all the way out. Anyone have the same problem??
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Old 06-20-2007, 11:53 AM   #2
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Car: 89 ws6
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Re: Fuel Pressure too high (80psi)

Well the best thing to do is start with the basic stuff like blowing out the fuel lines to make sure there is not a blockage in them causing a pressure rise. You can disconnect the fuel lines before they meet the tank and near the steering colomn under the hood. Best to have two people so one person can plug there finger over the other. i would spray carb cleaner in there as well. These cars are getting old so possibilities of build up in the lines is much greater. Even in the fuel rails there could be blockage. This may not slove the issue but helps narrow down the possibilties. Could just be a bad regulator.
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89 formula 5 spd, orignally tbi. Motor and pcm taken from an 87 iroc. 355 4 bolt,hsr, afr 195 heads, gmpp .480 lift at .5oo, 235 duration at .050 116 lobe sep. 24lb inj., 52 mm bbk tb,1 3/4 wrapped, headers, 3 in force 2 cat back, custom CAI, gutted mas, 3.o8 open diff.
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Old 06-20-2007, 09:51 PM   #3
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Re: Fuel Pressure too high (80psi)

Sounds like you may have pinched the return line.
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Old 06-20-2007, 09:51 PM
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