1999 GMC Savana fuel pressure reg.

ERIC

MEMBER
1999 GMC SAVANA
V8
2WD
AUTOMATIC
110,000 MILES

Hi, I have recently replaced my maf sensor, fuel filter, upflow o2 sensor, and donut gaskets between th manifold and exhaust. And im still burning super rich. A mechanic friend suggested I check/ replace the fuel pressure regulator. But, for the life of me I cant find it. I took of the dog box and looked on both sides up top and below. I have the part, so I know what it looks like, but I cant spot it. Can you help me out? Much appreciated. ERIC

4 Replies

WRENCHTECH

MECHANIC
20,761 POSTS

Is your check engine light coming on?

What are the stored code numbers?

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Monday, September 20th, 2010 AT 2:29 PM

ERIC

MEMBER
3 POSTS

Yes light is on. I think the code is p0175. It says :ecm has detected a rich or lean air/fuel ratio cond. On engine bank 2 failed ho2s21 bank 2 sensor 1

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Monday, September 20th, 2010 AT 2:43 PM

WRENCHTECH

MECHANIC
20,761 POSTS

If that is the only code, then it's only indicating rich on one bank which is odd. The fuel pressure regulator is under the upper intake manifold and they do have a history of leaking along with other components of the fuel injector unit although I wouldn't rule out the injector itself. If you pull the pulls, it should be obvious if any of them are fouling and you can identify the cylinder doing it. You can also do an injector balance test with a scan tool.

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Monday, September 20th, 2010 AT 2:50 PM

ERIC