Tractorguy1977
Member
1974 ford 4000su , so to date I have replaced entire fuel system except tank. Tractor was running ok made good power. It developed a miss in the engine on idle smother off idle , then the injector pump decided it wanted to spew out diesel from everywhere...
So it sat for a while. New injector pump CAV DPA matched up numbers got a ebay pump new $900 roughly. Installed it was not the bad of a job. I Mark the timing gears on front of engine to ensure nothing got out of line there , removed the 6 bolts all lines etc in and out.
Cleaned all the lines , new filters , fresh fuel all looks well. Got good flow from tank pet cock , good flow from filter bleeder , good flow from line to IP , all seems well. Open bleeder on IP took a few min got a dribble no bubbles. All seems good.
Open injector lines a touch , rolled engine over took a sec but fuel came from cyl 1 first closed line rolled engine over cyl 3 next then cyl 2 engine popped right off ran like new smooth as a sewing machine lol
Let engine set and run about 1100 rpm. Did so for around 10 min or so then started to get the miss to it again...smh here we go....
It slowly died , reached over hit key popped right off ran smooth for a min or two back to the miss.....(ready to unload the bmg 50 into this thing at this point.)
Ok sorry for long story here btw , I fired it up again this time with wrench in hand, cracked open injector lines one by one all got good spray engine really slowed and missed when cyl 1 and cyl 3 were open.but cyl2 only made small difference.
This post was edited by Tractorguy1977 on 07/15/2021 at 12:57 pm.
So it sat for a while. New injector pump CAV DPA matched up numbers got a ebay pump new $900 roughly. Installed it was not the bad of a job. I Mark the timing gears on front of engine to ensure nothing got out of line there , removed the 6 bolts all lines etc in and out.
Cleaned all the lines , new filters , fresh fuel all looks well. Got good flow from tank pet cock , good flow from filter bleeder , good flow from line to IP , all seems well. Open bleeder on IP took a few min got a dribble no bubbles. All seems good.
Open injector lines a touch , rolled engine over took a sec but fuel came from cyl 1 first closed line rolled engine over cyl 3 next then cyl 2 engine popped right off ran like new smooth as a sewing machine lol
Let engine set and run about 1100 rpm. Did so for around 10 min or so then started to get the miss to it again...smh here we go....
It slowly died , reached over hit key popped right off ran smooth for a min or two back to the miss.....(ready to unload the bmg 50 into this thing at this point.)
Ok sorry for long story here btw , I fired it up again this time with wrench in hand, cracked open injector lines one by one all got good spray engine really slowed and missed when cyl 1 and cyl 3 were open.but cyl2 only made small difference.
This post was edited by Tractorguy1977 on 07/15/2021 at 12:57 pm.