Fuel 93 5.0 fuel problem

[Noobz347]

How new? Did you replace it while chasing down this issue or did you replace it before the issue started? -- Disregard. I see earlier in the thread where you replaced it to try and solve the issue.


Two things come to mind after reviewing the thread:

Well still no luck with fuel issue l. Replaced one leaky injector got car to hold fuel pressure now holds then slowly leaks down. Still dumping fuel in cylinders. Guess my only other option is to replace all the injectors.???

This needs to be resolved. This cannot happen. Check for stray voltage with the key in the [On] position and engine stopped. If you don't find anything on the electric end then yeah... Every one of those injectors is suspect.


The only other thing that I can think of that matches your symptoms with [no] visual fuel leak is:

In-tank fuel pump internal pop-off has: popped off. This would mean a new fuel pump. Would you happen to know what specific fuel pump is installed?


I'll go back though... If you have injectors dumping gas into the cylinders with the engine off and fuel system pressurized then that is a huge problem.

 

[Noobz347]

Pull the injectors and lay them out with a paper towel under each.

Jump the fuel pump at the relay connector and wait...

 

[bjohnson6519]

These are brand new injectors just put them in. Oil smells like gas again just changed it.

 

[Noobz347]

These are brand new injectors just put them in. Oil smells like gas again just changed it.

That does not eliminate the possibility of stray voltage holding the injectors open.

 

[bjohnson6519]

Fuel pump is a tanks inc in tank fuel pump.

 

[AeroCoupe]

That is good to know on the harness as I hate chasing wiring issues on something that is supposed to be plug and play.

Pretty sure Tanks Inc is a Walbro dealer so the pump should be good. What brand of injectors are they and where did you buy them? I would still pull them like Noobz is suggesting. I would be curious to know what they looked like.

 

[bjohnson6519]

If prime the pump and I pull the fuel pump relay it runs a lot better. Makes no sense. Until it runs out of fuel.

 

[AeroCoupe]

Does it run like a normal engine without all the bucking and too rich?

 

[bjohnson6519]

Yes

 

[bjohnson6519]

I pulled the fuse to the injectors and car wouldn't run so pretty sure the problem is not with the injectors. Checked all the grounds and they look good. Guess the fuel pump is pushing too much fuel but the pressure is at around 25?

So we have new ECU, new injectors, new regulator, new plugs, new distributor, new engine. Car ran smooth when I put it together then didn't all of a sudden. Black smoke bucking, wet plugs and fuel in the oil. If I pull the relay car runs smooth until it is out of gas. I am sure if I take it to a mechanic they would find the problem right away.

 

[AeroCoupe]

Doubtful. These ECU's are OBD-I so over 30 years old. Not many old head techs left that know anything about them.

Just because you unplug the injector fuses (Painless has one for the left bank and one for the right bank) does not prove they are good.

 

[bjohnson6519]

The guy who rebuilt the ECU tested it in a Fox body he had and everything was good.

 

[AeroCoupe]

So going back to the injectors, what brand and where did you buy them? Do you have any pictures of them?

 

[bjohnson6519]

Rock Auto GB REMANUFACTURED

 

[AeroCoupe]

So let me start with saying I’m not busting your balls. Those injectors are junk. Lots of reviews on them with spray pattern issues, leaking, bad coils, etc.

You need to pull them and test them. If they are bad get your money back and buy some EV1 Bosch injectors.

 

[bjohnson6519]

 

[bjohnson6519]

Those are the ones I took out

 

[bjohnson6519]

 

[bjohnson6519]

The ones I put in

 

[AeroCoupe]

I would have the originals flow tested and cleaned. When you get them back install them and then send those other ones back for a refund.

I’m not saying this is the issue but it’s a fueling problem and they are suspect as hell to me.