Hello all (and most hopefully Subford),

95 F-150, 4.9L, 5speed manual

I was having poor fuel pressure issues with my two old tanks and pumps. Once I got the bed off and looked inside, they were filled with sludge and darn near black gas.

Rather than spend the time and money to clean the tanks and put in new FDMs, I found a Spectra Premium bundle online that included new tanks, new hangers, new FDM, etc. I bought both a front and rear setup.

I've got them both on and wired in. I had to cut off the Ford connector and splice on a new one. I'm almost positive the wiring is done correctly. I've checked it against the both the original tank wiring and the original wiring connector.

However, I have a no-start situation. Both pumps prime when the key is on. Both put out 55psi when cranking. But the damn thing won't start.

Inertial switch is in the normal, non-tripped position. I appear to be getting spark. At random, it will act as if trying to start, but never runs.

I'm going to swap some wiring again to see if that helps. Any insight you can provide will be greatly appreciated. I only hope it arrives before I bald myself pulling my hair out.

Thanks!

EDIT: She's throwing a 542 code, KOEO. And I tried switching the wires: no dice

 

If you have 55psi at the fuel rail while cranking I would not think you have fuel problem.

Check the injectors to see if they are firing.
Make sure you have good spark.
Try holding it on the floor while cranking. It may be flooded.

 

Is a noid light good enough for the injectors? I did read spark on the first cylinder using my timing light, but didn't check the others. I've tried holding to the floor, but all I get is an occasional backfire.

 

Yes a noid light would be good enough.

 

Alright. I'll check her tomorrow. Don't you just hate putting money in a project, only for it to be worse than before you changed stuff? One the plus side: there's a marked difference in pressure drop once I kill the key

 

Also, if there's no fire to my injectors, what should I look? I may take a crack at it early tomorrow, so I figured I'd have some possible things to look at going into it

 

If you have no grounds to the injectors and you have spark I would look at the computer or power and grounds to it.

 

What should I look at if my injectors are firing, I'm getting spark, and it appears my pumps are working?

It does put out some smoke while cranking, so I'm at a loss

 

Fuel, Air, Spark. Those are the ingredients for combustion....

Do you have good fuel in it? Backfiring could be a cause of pre-ignition I believe.

 

Yep, fuel is fresh. I put 5 gallons in each tank. Filter is pretty new. Injectors were cleaned a few weeks ago.

Hell, I had the thing running a few days ago before I put these new tanks/fdms on. I can't imagine what could've changed in that time, save for the tanks and pumps

 

Ok, I've checked and I do have power to my injectors. The noid light flashes when cranking. I've pulled a plug and confirmed I do have spark.

The pumps still prime when I turn the key, but I've made no progress. Every fuse in the truck is good. I've tried swapping relays, but to no effect.

How can I ensure I'm getting air, or my sensors are registering properly? I'm at a complete loss.

Throw out any and all suggestions and I'll check em. This is nuts.

Thanks

EDIT: I'm thinking it's a timing issue. I tried running it with starter fluid: no dice. She won't start. If I put the pedal to the floor, and try without starting fluid, she will backfire. If I try with starting fluid, I have fire shoot out of my intake. So, how do I go about checking timing, ie, which notches on the flywheel?

 

Id get friendly with a dmm and start testing all your sensors. Check out oldfuelinjection. Com. There is info there on what certain sensors should read.

 

Ok, slight update. I did manage to get her running. She's smoking like hell, though, great puffs of white.

I have no clue what I did. All I can think is my TPS is bad, because I removed it and she cranked. I replaced it and she cranked again.

 

All,

Ok, so I've got it running and took her for a spin. She generated a 998 and a 122 code. I find that odd because I just replaced the TPS. Did I forget to do something I should have? I bolted it back up and plugged in the harness. Did I miss something.

She stalls out at idle, but is driveable if I keep the RPM up. She does tend to surge a bit, though

 

Ok. I read on one forum where the MAP sensor can give problems, so I disconnected both the vacuum line and electrical harness. The truck immediately began to idle better, so I bought a new MAP sensor, hooked it up. Bam, the truck won't idle now.

I've made progress, as it will now run when full warmed up. I appreciate the help, guys. Now if I can just get her to purr while idling.