HOW DO I PRIME FUEL PUMP

1. #1Truck Shop2023-09-09 17:35

   Ok-there is no hand pump on any 855's through N14's. Fill the filter install, there is a plug on top of PT injection pump, remove plug dribble fuel in till it won't take any more install plug. Crank it over till fires. * Why does it need priming? Was work done on it? Has it been setting?

2. #2theresa.piper772023-09-09 17:55

   Yes been sitting. Work has been done. All new fuel lines throughout

3. #3boaterri2023-09-09 17:57

   Perhaps you could loosen the output side of the pump and put 2-3 psi of air in the fuel tank (plugging the vent of course) to drive the fuel thru the lines.

4. #4theresa.piper772023-09-09 17:59

   Working on it tomorrow. Gonna definitely try.

5. #5Truck Shop2023-09-09 18:16

   Cummins 855's normally self prime if filter & pump are filled. Below the plug to remove to fill is circled. *

6. #6funwithfuel2023-09-09 18:36

   If it's been sitting a long time, you might wanna drain the water off the bottom of the tank and check inside for algae. Just a thought. Also, maybe make sure the shut-off solenoid is working or use the manual thumbscrew.

7. #7Truck Shop2023-09-09 20:09

   Manual screw is pictured above between the two brass fittings, on the front side of fuel shut off solenoid.

8. #8cfherrman2023-09-09 21:00

   This is how I prime my N14. Stand pipe leaks a bit and will need primed if it sits for a week.