[the black monnster]

yes that does sound like it could be the problem but i had the same problem for while and i went to advance auto and got my battaries checked and they where fine but my alternator needd replaced

 

[Lil' Red Express]

I'd change the fuel filter first. if that don't fix it then you have a fuel drain back problem. Have you ever changed the rubber fuel lines? Especially the return line off the pump. They like to come apart internally and cause this problem.

 

[steveomiami]

Do you mean the rubber line going from the pump to the metal fuel lines? I havnt messed with since I bought the truck but they look newer to me. Im hoping the fuel filter it does look old and even when the truck was running well it would roungh rough if revving over 2000 rpm......im crossing my fingers on the fuel filter. Any other ideas?

 

[FlaCracker]

Also, check the following:

- Remove and clean out the fuel-strainer, just to the left of the LP.
- Check fuel pressure, you may have a bad fuel-overflow valve.

 

[steveomiami]

ok I replaced the fuel filter....also the thing that the fuel filter screws onto(the actually threaded part) was super loose and not sealed at the top. I put everything together and now it starts as soon as i touch the key. Now i get white smoke and rough around 2300 rpms..... maybe overflow valve?

 

[steveomiami]

or is that just from where the pump is defueling ?untill there it runs good, better than ever

 

[Kronic_187]

i'd say bump your timing

 

[jbabb]

try this. take a lenght of 1/2 " fuel line and attach to the inlet side of the lift pump. drop the other end in a can of fuel. prime the lift pump and start. if your symptoms go away, the problem is on the suction side between the pump and tank. replace all the rubber lines and quick connects. there is also a piece of braided line at the firewall that could be leaking. youll have to drop the tank to replace the lines there. its not that bad to drop the tank I dropped and reinstalled mine by myself with a half tank of fuel in it. floor jack and a piece of plywood or other board on top of the jack . I think its pretty common as these trucks get older. get some diesel rated fuel line. 3/8" inlet I'm not sure what the return size was. gasoline line will work for a while but I think it starts to break down from exposure to the diesel. good luck.

 

[Joe G.]

Read this: http://www.cumminsforum.com/forum/94-98-tech-articles/58777-joe-gs-fuel-system-writeup.html

 

[trackrider750]

I had the same problem i replaced my fuel pump and it turned out to be my return fuel line , some times they wear out internally and create a flapper valve that stops fuel delivery, its a cheap fix under $20, hope this is useful.

 

[steveomiami]

ok i ran it up to 2500 rpms on the street and it doesnt put out any smoke and runs smooth so its only when free revving it in drive

 

[steveomiami]

I took the truck out and ran the rpms up on the street to see if it does the same thing. in od it would only rev a little over 2500 and around 90 something rpms but there was no smoke. it only does in in park free revving it

 

[MX26]

White smoke on a cold startup is normal. Both of mine do it.