Cummins ISC 350 Hesitates @ High RMP
Hello All, I have the ISC 350 in my '01 Windsor. On my last trip from Redding to Central Oregon, after 50 or so miles I began ascending grades, and shortly after my engine began hesitating and stut...
Forum Discussion
Changing your fuel filters should solve the problem. You should have two and I'd change the primary one (first one usually with a water drain) and see if that solves the problem. The nice thing about a Cummins is that you put the filter on dry and then turn your key on for 30 seconds several times as your lift pump primes the system.
I had much the same problem last summer and changing the fuel filters did not solve. Decided to change the lift pump although leaking is the usual problem... anyway that did not fix the problem so Googled Cummins code 329 which the shops computer was showing.
1... change the fuel filters. Done
2... check for air in the system. Installed a clear plastic tube in the fuel line at the second filter ($10) and I had air in the system. Solved it by taking the very tight fuel line off at the tank and putting it back on not as tight... YES that is all it took to stop air getting in. Had a big change in temp when this started and a line that had not given any problems in 65K miles and was on tight started to let air in. KISS wins.
Here is the orginal post with more details of that adventure and education.
I had much the same problem last summer and changing the fuel filters did not solve. Decided to change the lift pump although leaking is the usual problem... anyway that did not fix the problem so Googled Cummins code 329 which the shops computer was showing.
1... change the fuel filters. Done
2... check for air in the system. Installed a clear plastic tube in the fuel line at the second filter ($10) and I had air in the system. Solved it by taking the very tight fuel line off at the tank and putting it back on not as tight... YES that is all it took to stop air getting in. Had a big change in temp when this started and a line that had not given any problems in 65K miles and was on tight started to let air in. KISS wins.
Here is the orginal post with more details of that adventure and education.
