1997 Chevy Suburban starting

JAMBA54

MEMBER
1997 CHEVROLET SUBURBAN
V8
2WD
AUTOMATIC
185,000 MILES

To start after sitting overnight I must pime throttle body with gas or run the battery down getting started. It has a new fuel pump and filter is clean. Its as if its losing its prime after sitting more than 12 hrs. If I crank in morning its ok thru the day but next morning is not ok. Its not elec. IM sure its a fuel del. Proplem

3 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

With either the 7.4L or the smaller V-8's the fuel pressure regulators will do what you describe. They bleed the pressure down overnight then the system is full of air and has to rebuild pressure in the morning. Did you install a high quality pump as well? More than once I have had to go back in to repalce a less expensive pump for issues. Can you hear the pump run when you first turn on the key in the morning? Try cycling the key (on-off-on) a few times in the morning to run the pump a few times and then crank it to see if it builds pressure faster. Also may want to install a fuel pressure gauge to see exactly what the pump is doing.

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Sunday, February 14th, 2010 AT 8:32 AM

JAMBA54

MEMBER
2 POSTS

My fuel pressure is ok have checked. I put a new not rebuilt fuel pump, so if I understand you think the regulator is bad and leaking down over time. If so a new valve should correct problem

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Sunday, February 14th, 2010 AT 8:41 AM

2CARPRO JACK

MECHANIC
11,533 POSTS

If it is the regulator then it can be repalced for a resonable cost. Have you checked fuel presure in the morning when this is going on? What psi was the pump at and how fast does it bleed off if you turn key off? What size engine too please

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Sunday, February 14th, 2010 AT 9:52 AM