will not start!!!

I have an 84 s-10. Started with a 1.9 changed to 4.3 tbi. Now changing to 4.3 cpi. It will not start. It is turning over fine I am getting spark and 40psi fuel pressure. The fuel pump is not switching on now. i have primed it. it worked fine yesterday. today nothing. the fuel injector was stuck open replaced it and now it is not getting any fuel. I can get it to fireup with starting fuild. Runs for a few seconds and back fires out the intake and dies. HELP!!

I have changed all relays and fuses

Sounds like fuel pressure issue. A 4.3 CPI usually requires 55-60 lbs to just START. Then 60-65 to run. If you have the original pump it just may not be up to the task. Anyone else?

it is 38 to 42 psi dick don't talk like you know what is gong on I need some really help not bullshit

OK chump. Never heard of a 4.3 running on that low a pressure, but then again you aren't telling anyone what it came out of or anything else that would be helpful. Just name calling and so forth. My 4.3 (S-10 Blazer) takes 55lbs min. So does most 4.3 with fuel injection. Talk about bullshit? Good luck.

it is 38 to 42 psi dick don't talk like you know what is gong on I need some really help not bullshit

Hey dickhead, he is right, so stick your attitude up your ass.

Your truck requires 55-61psi for the CPI injection system to work.

Any less and it won't work.....PERIOD.

Don't come onto these forums and pull attitude with people trying to help you.

If you want to be a complete asshole, do the work yourself seeing you seem to THINK you know everything.

I am very sorry you guys were right I am just tired of the truck. I have put way to much into it. If I had credit I would just go buy another. I will leave the attitude alone. SORRY!

What would cause the fuel pump to push 40 psi instead of 58-64psi 94 blazer 4.3 cpi

Defective or the wrong pump.

You sure you have a fuel pump for the CPI system installed?

defective pump could push 40psi?

yip, weak, as I asked before, is it a CPI pump?

thanks alot I will change it tomorrow and again I am very sorry!

thanks alot I will change it tomorrow and again I am very sorry!

Can you answer the questions please

Is it a CPI pump for a CPI system?

The CPI injector could be shot too and not holding pressure.

Yes it is a cpi pump. I have put a new pump in i am getting 61 psi. the fuel pump is not turning on with the ignition but i have the test terminal hooked up and the injector is not getting a signal. Is it the ecm?

I have a new injector also

So the fuel pump is not priming when you put the key to on?

You don't hear a hum?

nope ihave changed all relays and fuses and the oil pressure switch

I would check the sending unit and the wiring going back to the pump then.

hey BlazerLT I like your truck you have done a nice job. It is nice and clean. You said you were looking for a front valance?

hey BlazerLT I like your truck you have done a nice job. It is nice and clean. You said you were looking for a front valance?

Yes, looking for something a little more aggressive looking than stock.