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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / November 2007fuel pressure test procedure?
hello, my mechanic friend hooked a pressure gauge onto the incoming fuel line,which he disconnected from the fuel rail, and then turned the key to on, to see if there was pressure present. my Haynes book says to put an adapter between the inlet hose and the fuel rail with a gauge attached to it and then start the car to check the pressure. which way is correct or are both methods ok? > hello, my mechanic friend hooked a pressure gauge onto the incoming fuel > line,which he disconnected from the fuel rail, and then turned the key to > on, to see if there was pressure present. my Haynes book says to put an > adapter between the inlet hose and the fuel rail with a gauge attached to it > and then start the car to check the pressure. which way is correct or are > both methods ok? Both methods test different things. >hello, my mechanic friend hooked a pressure gauge onto the incoming fuel >line,which he disconnected from the fuel rail, and then turned the key to >on, to see if there was pressure present. my Haynes book says to put an >adapter between the inlet hose and the fuel rail with a gauge attached to it >and then start the car to check the pressure. which way is correct or are >both methods ok? The regulator takes fuel FROM the rail, and returns some to the tank. So if you connect a gauge JUST to the incoming fuel line, what you measure will be a lot higher than the normal rail pressure. That's good enough to tell if your fuel pump is operating, but it doesn't tell you anything about flow rate or if the regulator is working. If you just want a go/no go test on the pump, your friend's test is okay, but if you want more detailed information you'll need to measure it at the rail. --scott  Signature"C'est un Nagra. C'est suisse, et tres, tres precis." thanks for the replies :-) >>hello, my mechanic friend hooked a pressure gauge onto the incoming fuel >>line,which he disconnected from the fuel rail, and then turned the key to [quoted text clipped - 15 lines] > the rail. > --scott > hello, my mechanic friend hooked a pressure gauge onto the incoming fuel > line,which he disconnected from the fuel rail, and then turned the key to > on, to see if there was pressure present. my Haynes book says to put an > adapter between the inlet hose and the fuel rail with a gauge attached to it > and then start the car to check the pressure. which way is correct or are > both methods ok? From this method you wont find the correct ful pressure. This can be find out that the FUEL PUMP is working thats all.To check the acctual fuel pressure you have to do the BACK LEAK test only. Randy Pape <rpape1@wi.rr.com> wrote in article <474e3099$0$9895$4c368faf@roadrunner.com>... > hello, my mechanic friend hooked a pressure gauge onto the incoming fuel > line,which he disconnected from the fuel rail, and then turned the key to > on, to see if there was pressure present. my Haynes book says to put an > adapter between the inlet hose and the fuel rail with a gauge attached to it > and then start the car to check the pressure. which way is correct or are > both methods ok? Many of the phrases, photos, and instructions in Haynes manuals are generic - not car specific - in nature. That's one way they can keep the price so low. The same phrase is probably used in GM, Ford, MOPAR, and foreign car manuals by Haynes. Find out what method the *factory* service manual for your car actually suggests.
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