I bought this truck a couple of weeks ago. It has a Orileys crate engine with less then 4000 miles. It did a slow start on the front tank but would run fine on it you use the rear tank to start then switch over. Now it has out running all together. It turns over acts kinda like it wants to start if you mess with the gas pedal but diesels and dies. My first thought was the cat was clogged so I cut it loose. I cleaned the air intake valve. Then I ran the codes it came back with 23 and 33. I replaced TPS and it did nothing and the EGR is new. The distributor is new as well as cap, rotor, wires ect. The trans shifted kinda hard after doing some reading in here that why I thought it was the TPS.

Thanks in advance!!!!

 

Did you replace the ignition parts before the no start or after? If the guys here taught me anything, it's that just because a part is new, doesn't mean it's not faulty/bad...your problem with the front/rear tanks makes me think it's fuel related, but I'll let someone who's a lot smarter than I am give you better advice. You need three things: Fuel, spark, and air

 

It does sound like a bad rear fuel delivery module with bad valves and now its pump has quit.

 

Start by verifying spark and that you have fuel pressure.

 

Everything was replaced before I bought it except the tps.

 

40 lbs when I turn the key on. Won't stay running long enough to see if it drops.

 

I have been on here for two days reading post and I'm suspicious of the map sensor. What do y'all think about that?

 

Do you still have the TPS code? You can try unplugging the MAP sensor's electrical connection. It should at least start.

 

A 1995 F350 should have three digit codes. The exception would be if it has a C6 transmission. "Code 33" is most likely System Pass Code 111, then repeated. The latter is frequently misinterpreted as two digit Code 33 (111 pause 111).

 

Well Orieiys tested the ICM it showed bad came home put a new one in and no difference. I'm at a loss at what to try next.

 

I hope the ICM you put in is Black in color. Your truck is not wired nor have the PCM Computer to run a Gray ICM.

 

Yes it is black

 

I have spark at the coil wire with an old fashioned screwdriver test.

 

Put a fuel pressure gauge on it and see what you have.
You can rent a fuel pressure gauge for free at most auto part stores.

 

It has 40 psi when I turn the key on. Will not run long enough to test running.