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#1
02-28-2008, 04:32 PM
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fuel question
I checked the fuel pressure with a 3VZ-FE engine and it was within specs. Once I turned off the engine the pressure went down to zero within a few seconds. Does this sound like a bad fuel pump?
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92 300ES 00 Sable DOHC duratec 86 Camaro Z28 Last edited by DJPsystems; 02-28-2008 at 05:17 PM. 
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#2
02-29-2008, 11:28 AM
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Re: fuel question
The fuel system should retain the built-up pressure even after the engine is shut off. Finding where the leak is should be your starting point.
Presuming that the fuel pressure gauge is installed on or near the fuel rail... Find a section of fuel line that is rubber, such as those coming from the fuel tank. You may have to remove the rear seat to access them. Turn the key ON and let the pressure build up. Clamp the hose section with a vise grip or other suitable tool...just tight enough to stop the fuel from flowing. Shut the engine off and see if the pressure still drops. If it does, the leak is forward of the clamp site...if not, it's behind. Most common leak sites are the fuel pump (a bad or clogged one-way valve) and the injectors (dirty or clogged seats). Good luck.
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Current Garage: 2009 Honda CR-V EX 2006 Mazda 3i 2004 Chevrolet Silverado 2500HD 2003 GMC Envoy XL 2000 Honda ST1100 2000 Pontiac Sunfire Vehicle History: 2003 Pontiac Vibe AWD - 1999 Acura Integra GS - 2004 4.7L Dakota Quad Cab 4x4 - 1996 GMC Jimmy 4wd - 1995 Chevrolet C2500 - 1992 Toyota Camry LE 2.2L - 1992 Chevrolet S10 Ext. Cab 4.3L - 1995 Honda ST1100 - 1980 Yamaha XS400 - 1980 Mercury Bobcat.
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#3
03-01-2008, 12:28 AM
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Re: fuel question
I am thinking that it is the fuel pump. I do not see or smell any visible leaks anywhere. Sometimes the car is hard to start, seems like it is not getting enough gas. Also the car does not have as much power as it should.
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92 300ES 00 Sable DOHC duratec 86 Camaro Z28
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#4
03-08-2008, 12:31 AM
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It was the fuel pressure regulator
The way I found this out was I plugged the return line, then I turned the key to on and I "bumped" the fuel pump by pushing on the flap on the air flow meter for 2 seconds and the pressure shot up and stayed there. Then I went to Napa and got a pressure regulator, put it on and it was bad!(did not hold the pressure) So I took it back and I decided to get one at the dealer and it is fixed the problem! It starts right up and the car runs better now.
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92 300ES 00 Sable DOHC duratec 86 Camaro Z28
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