View Single Post
  #21  
Old 04-29-2015, 10:39 AM
v8volvo v8volvo is offline
Supporting Member
 
Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
Posts: 1,618
Default

Did you try checking for water in the fuel, as ngoma suggested?

The fact that the symptoms began immediately after refilling the fuel tank is extremely important. You should use that as a huge clue.

Before you start taking the engine apart and replacing injectors, you NEED to confirm that the engine has a steady source of high quality, clean diesel fuel with NO air or water or gasoline in it and free fuel flow with no restrictions. The way your engine started and ran in the video you took strongly suggests major fuel restriction and/or air in the fuel and/or fuel quality issues.

A stuck injector letting compression burp into the fuel pump is a small possibility, but it is DEFINITELY NOT the first thing to investigate.

Personally, I would STRONGLY suggest getting an external fuel supply (i.e. a gas can filled with fresh, clean diesel fuel from a known good fuel source) hooked up before the filter, install a NEW fuel filter dry with no fuel in it (making sure the old filter O-rings are removed and the new O-rings are in proper position and lubricated and the filter seats and screws on tight), and, using your electric fuel pump, prime the new filter with fuel from the external can. (Loosen the bleeder screw in the filter head, energize the pump, then tighten the screw when fuel comes running out with no air in it.)
Then, let the electric pump continue running, loosen all six fuel injector unions, and crank the engine until you get a good squirt of good-smelling diesel fuel out of each injector union.
Then, tighten the injector connections and start the engine. Try to keep it running for a while to ensure it is only running on the fresh fuel from your external supply. See how it runs.

If it still runs poorly after doing all this, THEN your next step will be to investigate other possibilities. Candidates would include a stuck fuel injector or, also possible, slipped injection pump timing, or others. But if the engine is running on a contaminated or otherwise compromised fuel source, you can go on forever replacing other parts and it will still never be right. First you have to rule out any chance of trouble there, then move on to other areas.
__________________
86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k

Last edited by v8volvo; 04-29-2015 at 01:42 PM.
Reply With Quote