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Crankshaft sensor?

Tiny
CHIPPER74
  • MEMBER
  • 1999 CHEVROLET EXPRESS
  • 200,000 MILES
This van is the 3500 5.7. Fuel pump was making weird noise so I checked the pressure, it was low. So I replaced the pump and after tons of atemps to start it finally turned over and ran fine but as soon as I shut it off it would not start again. I hooked code reader up and the reader said error
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Tuesday, April 23rd, 2013 AT 7:03 AM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
What is your fuel pressure now and how quickly does it come up to regulated pressure?
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Tuesday, April 23rd, 2013 AT 7:37 AM
Tiny
CHIPPER74
  • MEMBER
  • 2 POSTS
It goes up to about 60 then right back down to 0. The pump runs for about two seconds. I checked the connectors to fuel pressure sensor too
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Tuesday, April 23rd, 2013 AT 8:12 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
You need to determine where that pressure is leaking off to, whether the pump is letting it siphon back into the tank of is it leaking at the injector into the engine. You can do that by pinching off the feed hose quickly after building pressure but be careful not to pinch plastic hoses. Look for a rubber section if it has one.
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Tuesday, April 23rd, 2013 AT 8:39 AM

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