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Sometimes hard to start

Tiny
BILLHVAC
  • MEMBER
  • 2003 BUICK CENTURY
  • 3.1L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
No check engine lights on. Very seldom excessive pumping gas pedal required to get started. But before it gets started I hear a little puff of air sound like a back fire, but not as loud. Then it starts. It has been doing this before I had problems with VSS and fuel system. I replaced EVAP purge solenoid and fuel PSI regulator, fuel tank, PSI sensor and MAF sensor. Had valve job done several months ago. Wires plugs one coil PAC. Also maybe unrelated, I took fuel tank down. Where tank vent hose is I have got a 3/8 in hose two feet long come off tank unhooked. Looks like it has been there for a while. Spider web inside. Please help. Thanks.
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Thursday, June 29th, 2017 AT 3:15 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge as that may be low auto parts rent gauge. there should be no hoses hanging it may be a vent hose for tank check at filler neck. then check for a vacuum leak. See link for fuel pressure.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Thursday, June 29th, 2017 AT 5:48 AM

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