Results 1 to 21 of 21

Thread: fuel pump pressure for first gen

Hybrid View

  1. #1

    Array
    Status
    Offline
    Join Date
    06-12-2015
    Posts
    185
    Location

    Owensboro, KY
    Vehicle

    1991 Dodge Ram 50
    Engine

    4D56-T
    Automatic or manual? Surprised the little pump could handle that high of a viscosity if it was for a manual. We haven't been inside that pump for a while. We actually took it off to get resealed and to put it aside as a candidate for the 12mm plunger. We put on a newer 4D56 pump in its place. Haven't tried running it without a lift pump, but then I also don't really I intend to take that lift pump back off

  2. #2

    Array
    Status
    Offline
    Join Date
    04-13-2018
    Posts
    26
    Location

    Alberta canada
    Vehicle

    1991 Mitsubishi Pajero
    Engine

    4D56-T
    That was mercon v atf in a ZF 5spd. What it calls for.

    How's the newer pump working for you? Do you watch egts? I intend to do the same on my 4d55 Ranger build with a 1990 4d56 pump, only without lift pump. I had inspected and re-sealed it, punched in the pressure regulator a hair, and tweaked for a slightly higher then original boost. When I did that work I was also resealing a 4d55t pump for a guy in exchange for a parts truck - where the lift pump came from - along with spare injection pump. Fair deal we agreed. That IP I resealed is the one I mentioned had had damage to the drive shaft bushing. It had been run on the parts truck I inherited with the lift pump that, when I tried pumping atf, it took a long while before it spit out a big, diesel-pickled bug and began flowing.

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •