Hi. I had to jump start my 93 w250 and now i have power to everything and my truck turns over, but will not fire up. I have a electric pump and it will/was running. So there is no air in the injectors. Please help

 

somewhat of a universally present happenstance when jumping a vehicle especially older ones. You can pop fuses or even a “main relay” so check all your fuses and such then check back in with what’cha find. Because that main relay is in charge of running your ECU and most likely your ignition

 

Do you hear it come on and prime the system when you turn the key to on? When you crank it do you have spark?

 

Shoot a little starting fluid into the intake. If it still doesn't start, you aren't getting spark. If it starts then dies, you're not getting fuel. Quick way to eliminate possibilities.

 

The truck turns over and has fuel. I will spray some starter fluid to see if it fires up

 

if you know you have fuel, I’d avoid starting fluid. It can wash down the cylinder walls if your aren’t careful and cause scoring.

I genuinely believe if you check your ignition related fuses and whatever serves as the main relay/fuse for your ECU/PCM (whichever acronym they use for that year) it will be popped.

 

Thanks for all the help. I sprayed some starting fluid and it started. I found a loose wire on the fuel shut off. Replaced the worn connector and it starts. Thanks again

 

Loose wires and bad grounds cause more aggravation than anything else.