1997 Chevy Truck Fuel system

Tiny
TLUCAS
  • MEMBER
  • 1997 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 166,000 MILES
I run afuel pressure test.I had 40 psi wouldn't start.I cycle key sveral times got 50psi and barely started. Once it started ran 50psi and give it gas went up 5psi. Turned it off let it set 30min. Andpressure went to 45psi. Manual says 60-66 psi normal would u suggest replacing fuel pump or check something else?
Sunday, October 24th, 2010 AT 7:07 PM

9 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi Tlucas, Welcome to 2carpros and TY for the donation

That pressure is way too low-check if the fuel filter is clogged if not check injector and fuel pressure regulator if its leaking if all okay-also check the fuel pump check valve could be leaking too-all checks out-replace the fuel pump
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Sunday, October 24th, 2010 AT 7:44 PM
Tiny
TLUCAS
  • MEMBER
  • 5 POSTS
How do u check and where is the fuel pump check valve and how do you check pressure regulator under the plastic intake? Don't u have to take throttle body off too?
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Sunday, October 24th, 2010 AT 10:13 PM
Tiny
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Hook up the fuel pressure tester back and pinch the return line did the pressure increase? If so replace the regulator

What is the liter engine? 5.0 or 5.7 type of injection system
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Sunday, October 24th, 2010 AT 11:19 PM
Tiny
TLUCAS
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  • 5 POSTS
It's a 5.7
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Sunday, October 24th, 2010 AT 11:38 PM
Tiny
RASMATAZ
  • MECHANIC
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https://www.2carpros.com/forum/automotive_pictures/12900_fpr_31.jpg

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Sunday, October 24th, 2010 AT 11:50 PM
Tiny
TLUCAS
  • MEMBER
  • 5 POSTS
Where is fuel pump check valve and howto check
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Monday, October 25th, 2010 AT 12:18 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hook the fuel pressure tester back on, turn key On-record pressure readings and monitor how long it takes to drop to zero-if its more than 5mins there's nothing wrong with the check valve/injectors/regulator-replace the fuel filter and fuel pump
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Monday, October 25th, 2010 AT 4:40 AM
Tiny
TLUCAS
  • MEMBER
  • 5 POSTS
It takes about 30 min to drop from 52 to 40 and that's as far as it drops!So replace fuel pump even if it doesn't go to 0?
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Monday, October 25th, 2010 AT 1:02 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Did you check the fuel filter if it's clogged up-if ok, replace the fuel pump.
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Monday, October 25th, 2010 AT 1:14 PM

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