Fuel Pump 101

[JIMS59VETTE]

I have a 96' 5.7L I purchased knowing that whenever it rained , a day later it wouldn't start until what ever the moisture interupted dried out.I suspected no spark but using my timing light aas a spark tester it appeared I had spark. So I went to fuel next. When I turn on the ignition I didn;t hear the fuel pump whirring for 2 seconds as my shop manual implied. I went to the fuel pump relay and had a good ground to one side of the relay coil but no 12v to the other side. According to the schematic, this comes directly from the PCM. I haven't metered out the dark green/white from the relay to the PCM yet, but I would think the fuel pump prime thru the n.c. relay contacts should prime the pump for initial start-up. I guess I'm asking the question, am I going about trouble shooting this problem the right way?

[maxwedge]

Sounds like it. You should have 12v into the relay and 12v out during the prime event.

[Tyler5570]

I have had the Same issues , I had just got gas and as soon as i pulled out into the intersection my venture stalled, its been two weeks now i have replaced the fuel filter and check fuse also both are new now , but i get the feeling that the fuel pump is not working , it has been raining and snowing alot , how hard is it to change the fuel pump?? can anyone suggest anything else??? what is and where is the fuel pybass plug ?? i seen on another forum to check that ?? I need help christmas is going to suck if i have to go by a new van

[maxwedge]

Originally Posted by Tyler5570

I have had the Same issues , I had just got gas and as soon as i pulled out into the intersection my venture stalled, its been two weeks now i have replaced the fuel filter and check fuse also both are new now , but i get the feeling that the fuel pump is not working , it has been raining and snowing alot , how hard is it to change the fuel pump?? can anyone suggest anything else??? what is and where is the fuel pybass plug ?? i seen on another forum to check that ?? I need help christmas is going to suck if i have to go by a new van

You are in the wrong forum, please post a new thread in the proper forum for your van, thanks.

[JIMS59VETTE]

Fuel pump was the problem, just finished replacing the fuel pump and fuel tank sending unit. Truck started right up! many thanks to all contributers.