3.0 will not start. Need help asap.

[mike63fairlane]

92 Ford Ranger with 3.0. Belongs to my son. Started cutting out on him and then shut off. It has about 140000 miles on it. The fuel pump is about a year old. When you switch it on the fuel pump never shuts off like our other Rangers do. I think this has something to do with the problem. We have fire. I changed the cap, rotor and plugs also. i have 40 psi at the fuel rail when cranking. I also changed the fuel relay. Any thoughts on this?

 

[mike63fairlane]

My bad, 91 model. Anyway, engine will try to run with a little starting fluid shot in it. Since i have fuel psi at the rail (40psi) this must mean the injectors are not opening like they should. Going to pick up something today to test that. If that is the case what could cause it? I have changed the fuel relay could it be the ecm?

 

[mike63fairlane]

Checked injectors with test light and have fire on the red wire. Checked with noid light and light blinks with engine turning over. With the key switched on you can hear the pump running and fuel passing through the regulator and rails. If you spray just a little starting fluid in it in cranks right up. I do not understand

 

[Rearanger]

Fuel, spark, compression, timing, air. Looks like you got fuel and spark, I'd check timing.

 

[mike63fairlane]

Something to me is just strange about that pump running all the time with it switched on. it never did that before. It would prime up and shut off utill you tried to crank it. However like I said 40 psi when we are turning it over. I thought about timing but it seems it would not crank with the starting fluid if it was off a lot. Hate to start throwing parts at this.

 

[Rearanger]

Are the plugs damp with fuel?

 

[mike63fairlane]

Changing the pump. Poured gas on the air fliter and put it back together and it ran long enough for me to back up and pull forward on some ramps. One thing I noticed is even though it is at 40psi at the test gauge when I push the by pass button on the gauge to let gas out of the the little clear hose the psi drops to zero and the gas just does trickle out. This is with the pump running. Just dropped the tank. I will repost how it does with new pump. Now would be a good time to weld on it

 

[locovaca]

When's the last time you changed the fuel filter?

 

[mike63fairlane]

Changed filter first just to be sure. Before that about a year ago.

 

[mike63fairlane]

Not the fuel pump (insert d word here) Not the fuel reg. (nother d word) pulled injectors to see if I can clean them. All injectors check good with noid light. 40 psi of fuel pressure. Will not run. If it does try to run it acts like it is running out of gas. If you spray gas into the intake with a spray bottle and put it back on it cranks and runs great. you can even rev it up untill it runs out. What am I missing here???

 

[Rearanger]

You're getting pressure but little to no flow. There has to be a flow restriction between the pump and the injectors, it gives you static pressure but no flow to maintain presssure. You might try disconnecting the fuel filter and fuel rail then back flushing with compressed air to see if there is a restriction. Is it possible there's a fuel line crushed?

 

[mike63fairlane]

Don't think a line was crushed. It was running fine then started skipping and trying to shut off. My son said it did this three times with in a mile and then the last time it would not restart. Could it be the injectors are opening at the wrong time? Could the ICM cause this or maybe the Dist. ? I pulled the injectors just to see if the little screens have trash but do not see any. I will try blowing through the fuel line tomorrow. I am lost here

 

[Rearanger]

You said that with 40psi pressure that little to no fuel drained from the pressure release on the pressure gauge - that says fuel starvation not timing to me.

 

[mike63fairlane]

That was before I changed loud fuel pump. New pump very quite and psi jumps up quick. Also has fuel coming out of by pass hose on the check gauge a lot better now.

 

[Rearanger]

So as you crank it now with the fuel pressure gauge hooked up it maintains fuel pressure?