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Should the fuel system hold pressure after cycling the key with a pressure tester guage still attached?

Tiny
LILBUNNYFOOFOO
  • MEMBER
  • 1995 CHEVROLET BLAZER
  • 110,000 MILES
I ran a pressure test on the fuel system. It read 62~65psi when I cycled the key. Shouldn't the system hold pressure on the tester guage after cycling the key? Because mine went instantly down to ZERO psi after cycling the key. Im trying to determine why it wont start and run unless I prime it, and then it wont idle without footfeed/or/under 1.5 with footfeed on the tackometer. Im thinking it may be the fuel pressure regulator, because the fuel pump is sending enough psi by book standards? Please help assist me in this problem, it is a time sensative repair issue. Thank You!
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Wednesday, September 21st, 2011 AT 3:06 PM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Pressure is correct. Block off the return line to determine if the fuel pump check valve is at fault. If pressure falls, it is either the regulator in the spider or a bad fuel injector. If the pressure stays at 60, the pump is bad.

Roy
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Wednesday, September 21st, 2011 AT 3:13 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
I would have a different opinion here. Blocking off the return line is not going to test the fuel pump check valve. In order to do that you would have to immediately pinch off the FEED line between the gauge and the tank once pressure is built. If it holds then, you can blame the fuel pump check valve.
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Wednesday, September 21st, 2011 AT 4:17 PM

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