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1998 Chevy Suburban

Tiny
WAYNEBENESKY
  • MEMBER
  • 1998 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 77,000 MILES
What is the fuel pressure running on a 98 suburban 7.4 when I pinch the return line I get right around 60pis on the gauge but with out I get 34 at idle and 40 psi when I gas it I keep getting a check eng lite and the code are p0135 aND P0172 AND P0175 I KNOW WHAT THEY ARE AND IT DOES RUN A LITTLE ROUGH AT IDLE
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Saturday, April 5th, 2008 AT 9:32 PM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Should be 55-61 lbs with key on engine off. Sounds like you may have a weak pump. Also check the pressure regulator, yours may be blown causing the rich codes (0172, 0175) If any fuel is present in the vacuum line to reg, replace it
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Sunday, April 6th, 2008 AT 8:55 AM

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