1997 Chevy z71 5.7 vortec 4x4. Fuel problem.

Asked by Feb 07, 2016 at 11:02 AM about the 1997 Chevrolet C/K 1500 Cheyenne Extended Cab 4WD

Question type: Maintenance & Repair

Z71 5.7 Vortec.  Ive been having problems with
what I believe is fuel related. Started having
troubles starting. So i changed the fuel pump and it
started right away and ran just fine for a few days.
Then Started lugging when you hit the gas and
ultimately on another cold day didn't start.
Changed the fuel pump again, to another Delphi
pump, and fuel fitler, started just fine. And ran for
24 hours before acting up again. A friend checked
the fuel pressure and said It was fine, but when I
turned it off the pressure fell to 0 almost
immediately.  I started it today by clamping the
return line for fuel and cycled the pump about 10
times but when I push on the gas while running, it's
lugs and ultimately dies. My father says it could be
another bad fuel pump but before spending more
money on that, I wanted to get some suggestions.

2 Answers


It is sounding like leaky injectors, spider lines, and fuel regulator. Pressure dropping to 0 within 3 minutes is a good sign, It should only drop no more than 5 lbs in 3 minutes. Fuel pressure should be 56 to 63 lbs. I would do a dead head test on the fuel pump itself to verify that it is putting out 64 to 68 lbs.


I second injector assemly.

Your Answer

Chevrolet C/K 1500 Experts

  • #1
    Andrew Olsen
  • #2
    John Saffrahn
  • #3
View All

Related Models For Sale

Used GMC Sierra 1500
1,152 Great Deals out of 64,214 listings starting at $999
Used Ford F-150
3,136 Great Deals out of 219,092 listings starting at $1,200
Used Chevrolet C/K 2500
202 listings starting at $6,495
Used Dodge Ram 1500
431 Great Deals out of 11,068 listings starting at $2,000
Used Chevrolet Tahoe
783 Great Deals out of 41,561 listings starting at $1,987
Used Chevrolet Camaro
437 Great Deals out of 31,256 listings starting at $1,450
Used Chevrolet C/K 3500
203 listings starting at $4,199
Used Chevrolet S-10
13 Great Deals out of 1,239 listings starting at $1,550
Used Toyota Tacoma
655 Great Deals out of 45,099 listings starting at $2,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.