1998 Chevy Suburban

1998 CHEVROLET SUBURBAN
77,000 MILES • V8 • 4WD • AUTOMATIC
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WAYNEBENESKY
  • MEMBER
  • 6 POSTS
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
Apr 5, 2008 at 9:32 PM
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2CARPRO JACK
  • CAR REPAIR CONTRIBUTOR
  • 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
Apr 6, 2008 at 8:55 AM
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