1995 Buick Park Avenue wont start

ARAGONGARY

MEMBER
1995 BUICK PARK AVENUE
3.8L
6 CYL
FWD
AUTOMATIC
150,000 MILES

Put new fuel pump and what happens when you turn the key there is power to fuel pump and then after about ten seconds the power to fuel pump stops, replace fuse and relay still does it, why

Sunday, March 15th, 2015 AT 7:39 AM

5 Replies

WRENCHTECH

MECHANIC
20,761 POSTS

Unless the engine is running, it will be only 2 seconds that is stays on. It will continue to run when the computer sees a tach signal. It will shut the fuel pump off when there is no RPM signal.

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Sunday, March 15th, 2015 AT 8:39 AM

ARAGONGARY

MEMBER
4 POSTS

Does run then shuts down when fuel pump power stops

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Sunday, March 15th, 2015 AT 8:50 AM

WRENCHTECH

MECHANIC
20,761 POSTS

Then you have to find out if the pump power is really stopping or the pump is just consuming too much and find the cause.

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Sunday, March 15th, 2015 AT 8:52 AM

ARAGONGARY

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4 POSTS

. There is power to fuel pump for only about ten seconds then goes off

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Sunday, March 15th, 2015 AT 9:13 AM

WRENCHTECH

MECHANIC
20,761 POSTS

How are you determining the power is dropping out? If you are monitoring the gray wire and the pump shorts out, it will give yoiu the appearance of no power when in reality. it is just consuming it. If it truly is dropping out, then you have to determine where it is being lost by following a wiring diagram.