1HDT (LC 80 Diesel) Pump Setting (2 Viewers)

[mudgudgeon]

Hey guys, here is an update...
I fixed the problem by adjusting the screw. It used to burn my eyes when staying of the back of my car, but now it does not.
PD... After Installing a 3 inches muffler, the problem came again... I re-adjusted the screw 1/4 of turn right, and it stopped again.
Good post here, it was useful to me. Thanks.

That screw is the main fuel screw.
If gives you a coarse adjustment of the maximum fuel setting, a bit like swatting flies with a shotgun.

For best results, you need to use the other finer adjustments on the boost compensator.

 

[Jroc561]

Just to update this since I did it minutes ago:

I was able to remove the "anti-tamper" wire that goes through the bolt with just regular scissors from the junk drawer. To loosen the lock nut I used a deep 12mm socket, I was able to do this without moving the throttle arm.

At this point you are able to adjust it using a flat head. Trail and error says to adjust by 1/8 turn at a time because its highly sensitive.

 

[wagonteeth]

Your link doesn't work, are you able to fix it?

Tuning Up A VE Injection Pump

Here is a brief write up on how to turn up the power on your 1st Generation Cummins truck with a Bosch VE Injection pump. Low Boost Fueling Adjustment (Smoke Screw) Beneath the cap is a Torx T-25 screw and a lock nut that holds it. The locknut is 13 mm and has a 'break-away torque' of around 100 ...

mopar1973man.com

This might work.

 

[Hill Jaspe]

hello, is white smoke and high rpm a factor if fuel pump screw is not properly calibrated? thanks for the reply!

 

[mudgudgeon]

@Hill Jaspe

Need to give us more information.
Part throttle?
Full throttle?
Accelerating?
Cruising?

have you done any work recently?


White smoke is usually due to unburnt fuel.
Caused by bad injection timing.
Or, by air in the fuel system, which causes issues with injection timing.

 

[mudgudgeon]

@Hill Jaspe

Need to give us more information.
Part throttle?
Full throttle?
Accelerating?
Cruising?

have you done any work recently?

White smoke is usually due to unburnt fuel.
Caused by bad injection timing.
Or, by air in the fuel system, which causes issues with injection timing.

 

[Hill Jaspe]

@Hill Jaspe

Need to give us more information.
Part throttle?
Full throttle?
Accelerating?
Cruising?

have you done any work recently?

White smoke is usually due to unburnt fuel.
Caused by bad injection timing.
Or, by air in the fuel system, which causes issues with injection timing.

Good day, the car gets hard start, need to pump a little gas so that it could neutralize the idle. That’s when the smoke occurs. But even if i start to drive the car, the smoke reduces. We just had a top overhaul with the engine, newly cleaned injectors.

 

[mudgudgeon]

Sounds like air is getting into the fuel lines when it's parked.

If old fuel hoses were disconnected, it's likeky one has split, or isn't sealing properly because it's gone hard.