Expert: Mark Bisig - 1/7/2006

Question
My 1999 Chevy Suburban stopped dead in its tracks today.  Engine still cranks over, has spark, and no codes appeared.  I had it towed home to my shop and tested the fuel pressure at the top of the intake before the regulator.  It is measuring 20 psi.  I replaced the fuel filter and tested pressure again 20 psi.  I can hear the fuel pump turn on - except it sounds a little different and longer than normal.  I am suspecting it to be the fuel pump, but was told it could be the regulator, crankshaft or camshaft sensor.  Any suggestions on troubleshooting and eliminating these other possibilities?

Thank You

Answer
Hi Bruce, Yes it could be the fuel pressure regulator. I would remove the vacuum hose and look for any sign of gas in the hose. Now turn the key to make it dosen't leak out of the nipple on the regulator. If this checks good, I'll bet on a fuel pump!! You can plug the fuel return with your fuel pressure gauge on to see if it goes any higher then 20 psi, will the line plugged should be way high (80psi +).

Hope this helps

Mark