Postal Letter

can you help me on a 2005 cummins in a delivery van, is a ISB 185 model engine, going down the road it surges?

can you help me on a 2005 cummins in a delivery van, is a ISB 185 model engine, going down the road it surges and blows black smoke with every surge, seems to start and accelerate fine in Park but bad under load, appears to have fuel flow, not sure how to check amount of pressurer as the filters are prior to the transfer pump, but with a clear 1/2 inch hose stays full while running i have ran without air filter and still doing it, and the turbo feels free, but i haven't pulled air tube after air cooler, where would i find the fuel timer i don't have bubbles in clear tube, but the clear tube is ahead of the transfer pump

Public Comments

1. with the new low sulfer fuels the filters are probley clogged or the fuel timer is faulty
2. I would suspect an air leak on the suction side of the pump. Check the clear plastic line for any sign of an air bubble or bubbles.
3. Check AIR restriction.. Look at air filter and air ducts. That cummins will run forever...but it needs air flow.. The surging and black smoke means the truck is running too "rich" not enough air going thru the system.