INSTALLING A VAFPR ON A T.B.I. EQUIPPED CAR |
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Overview |
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On T.B.I. equipped cars, one of the first things that you can do, and should do, to compensate for other mods is to modify the fuel pressure. One problem with a traditional adjustable fuel pressure regulator is that it is a constant fuel pressure increase...the fuel pressure is higher at idle as well as wide open throttle (WOT). The problem that this creates is that at idle the car usually runs rich (too much gas), and at WOT, the engine usually runs lean (not enough gas...VERY bad). This is where the vacuum-adjustable fuel pressure regulator comes in. With the VAFPR, the fuel pressure adjustment depends on the vacuum the engine creates. Basically, without getting into a big technical discussion, there is a diaphragm inside the fuel pressure regulator. There is also a vacuum port of the "can" of the VAFPR which you connect to a good vacuum source on the intake. As the vacuum increases and decreases, the fuel pressure changes accordingly. This helps the air/fuel ratio stay in a safe range at almost all engine speeds.
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Finding a VAFPR |
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GM Adjustable Fuel Pressure Regulator |
GM Dealer |
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GM Part #: 17113186 |
$82.37 from Dealer |
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I don't know of any GM vehicle that actually came with a VAFPR on it from the factory. There must be some out there, because it is a GM part, but I have never heard of them. So, going to a junkyard and finding one is out of the question. But, if you go to any local GM dealership, or use one of the internet parts dealers, just give them the part number above, and you will be all set. It will come with everything you need to convert your old FPR to the VAFPR.
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Pictures |
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Here are some pictures you will hopefully find useful if you decide to do this mod to your car:
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