Re: Is there a way to test the FPR - Saab 900 Bulletin Board - Saabnet.com
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Re: Is there a way to test the FPR
Posted by JohnK (more from JohnK) on Thu, 24 Jun 2004 07:04:21
In Reply to: Is there a way to test the FPR, MichaelG, Thu, 24 Jun 2004 04:05:37
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A torn diaphram will allow gas to leak into the vacuum/pressure hose. Pull the hose off the intake and look for drips and a gassy smell. You can put a vacuum on it to see if it holds. You can just suck on it and spit out the gas and rinse mouth if you get some gas in your mouth. A mityvac is probably safer!
If no leaks but you still suspect that it's out of calibration, you can test with a fuel pressure gauge. I made an adapter out of an old banjo bolt to screw into the end of the fuel rail. A 3 bar fpr will read about 44.1 psi plus the intake pressure/vacuum, i.e. 3 Bar x 14.7 psi.
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