Engine/Transmission (1998.5 - 2002) 01 fuel problems

[larryj]

o1 Fuel problens

Truck starts good as long as the tank is full. tank drops to between 3/4 to

1/2 gets hard to start in the morning ,starts good the rest of the day

let sit for 5 to 6 hours hard to start again.

Another problem.

Every now an again going down the road will lose power Engine will go to idle.

engine will not die. after it reaches idle. you step on it she will run like A scalled dog. like nothing ever happened.

I did not take note of the reading on th fuel gugage.

think the two problems are related. May be problems with the suction out the tank would their be a check valve on the suction.

 

[JCyrbok]

o1 Fuel problens

Truck starts good as long as the tank is full. tank drops to between 3/4 to

1/2 gets hard to start in the morning ,starts good the rest of the day

let sit for 5 to 6 hours hard to start again.

Another problem.

Every now an again going down the road will lose power Engine will go to idle.

engine will not die. after it reaches idle. you step on it she will run like A scalled dog. like nothing ever happened.

I did not take note of the reading on th fuel gugage.

think the two problems are related. May be problems with the suction out the tank would their be a check valve on the suction.

could be a couple of things 1) VP44 fuel pump going out (with the hard starts and the dead pedal symptoms) 2) could be bad lift pump (hard starts) 3) could be air leaking into the fuel lines (hard starts after long sit) 4) could be bad fuel tank module (sucking air into the lines).



any Diag trouble codes set? If so what are they? (do the key on-off sequence to check them in the odometer window).



Hope this helps

J-

 

[AllianceDiesel]

like jcyrbok said could be deathcode, lift pump, module, or connector tube orings



try the key trick and see if that comes up with any codes

 

[Chief USA]

Sounds to me like the lift pump is either weak or dead AND the fuel filter is severely restricted and/or both.



Put a fuel pressure test gauge on the injector pump schrader valve and without the engine running, bump the starter without starting the engine. The lift pump should cylce about 25 seconds. What is the pressure??????? Next start the engine and observe the pressure. What is it?????????? If the pressure drops significantly upon engine start up, it is likely a clogged or restricted fuel filter. If it just lays there, it is the lift pump.



I strongly recommend replacing the fuel filter and then repeat the above steps. If the fuel pressure improves on engine start up... ... ... what psi is it?????? Anything less than 12 psi, I would replace the pump although you can get by with less, you will have much less flow and pressure while driving and accelerating.



I just went through this and replace the lift pump in my wife's truck with an Aertex pump. Her truck is bone stock so I think this pump will do the job just fine. It develops 21 psi static and holds about 15-16 psi during normal driving, and under a hard 5th gear pull to about 2,800 rpm would decrease pressure down to about 8-9 psi.



I also strongly suggest you key the ignition 3 times without starting the engine and leave the key in the on position the 3rd time you key the switch. Watch your odometer for codes. The test will begin with:



P PCU

any codes

P Done



P ECU

any codes

P Done. going from my memory. There are posts here that go into more detail.



code P0216 is the code you DON'T want. Injection Pump Timing Failure.

 

[larryj]

Update on fuel problems

Did the key on key off trick code P1693.

what does P1693 Mean

More info New FASS 150 new filters.

I was thinking about installing the drink straw.

 

[JCyrbok]

Update on fuel problems

Did the key on key off trick code P1693.

what does P1693 Mean

More info New FASS 150 new filters.

I was thinking about installing the drink straw.

p1693 is a "companion code" I believe. All it means is that some other part of the ECU or PCU is setting a code. basically it is the PCU saying "hey some one else that I work with set a code, keep looking. "



Make sure that when you do the key trick that you let it cycle through until the mileage comes back up in the window.



It will cycle the PCU and then say PCUDONE and then cycle the ECU and then say ECUDONE. Takes about 20 seconds once it starts reading until done. When the ECU is checked it will likely show a different code.



Hope this helps

J-

 

[AllianceDiesel]

yeah if thers a 1693 than there has to be another code, the 1693 is just a way for the ecm/pcm to tell the other modules that it has a code.



Did you have the lift pump on the side of the motor or in the fuel tank?

 

[Chief USA]

Larry, if all you are getting is a 1693 PCM code. I believe you can clear the code by achieving 5 successful no fault starts.



You may luck out and squeek by with replacing the lift pump and fuel filter if they are in fact the problem. Veryify. Work your way back from the injector pump first before you start replacing parts. Verify pressure too.

 

[JR2]

It sounds like a VP44 or the APPS to me. The hard start is typical of the VP and so it the dead peddle. When my Dad's went it did not throw any codes at all.