Blazer died

[wheels87k5]

I was going to work the other morning, and a nano second after I hit the railroad tracks, the blazer quit running. I'm quessing that something has come unplugged or knocked loose. I just haven't had the time to check. Work is keeping us busy but I get Sunday off so I can start the process of elimination then.
I ran a hot wire to the fuel pump relay, and the pump is humming so I know that didn't come loose. But I don't hear the click at the fuel pump relay. And there is no fuel coming from the injectors. Is there a way to test the fuel pump relay?
What could have come undone or unplugged?
Thanks for any and all help.
Willie

 

[Big Ray]

swap the relay with one you know works.

 

[Thunder]

I dont think it is the relay. If the relay went out while the truck was running the oil pressure switch should have kept the engine running. Even if the relay is not working your truck will start after cranking on it a while till the oil pressure comes up.
Before you do anything check to see if you have spark. Maybe one of the connections on the ignition system came loose or the dist module went out.

 

[ryoken]

yup, no spark = no fuel.....

my money is on the ignition module...

 

[wheels87k5]

The ignition module is only 2 months old but I'll swap it out anyway with a good spare. I know it's hard to believe that a part can go out so quickly but it has happened before.
You gotta love the quality of parts now a days. If it is the ignition module, it should still be under warranty.
I'll post the findings in a little while.
Thanks for the input.
Willie

 

[ryoken]

eh, just a semi-educated guess.... they can be finicky to begin with... give it a jolt like that, ya never know... I have heard that any module other Delco, your taking your chances...

 

[wheels87k5]

Changed the module.....still no start....but....I noticed the SES light does not come on.
I checked the bulb and it works fine....Didn't the SES light come on when you turned the key? and then go off? I can't check codes with the shorting clip either. I have checked both ECM fuses and the 2 plug-ins at the ECM itself. Possibly the ECM is fried? Is there a way to check the ECM?

 

[wheels87k5]

Problem solved.......it was the ECM 1 fuse.......My spare fuse was also bad.
The original fuse was hi-jointed. It would give me a good continuity reading, but as soon as it was put under load it would come open.
I think I'll take another route and skip the railroad tracks till they make them smoother to cross.
Thanks for all the replies and help.
Willie