Breakdown Information
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RV: Holiday Rambler Navigator
Cummins M-11 (450HP)/ Allison HD4060 (6-spd WT)
60,000 miles
1998
Breakdown: THREE in One Month!
Symptoms...
1) The day after taking delivery, drove 450 miles and engine began bucking and stalling and finally slowed to 10 mph and quit.
2) Drove 450 miles and engine would not restart after stop.
3) Drove 450 miles and engine began bucking. Engine would not restart after stop.
Effect...
Unable to get engine to operate normally.
Cause...
It was assumed to be dirty/clogged fuel filters. After changing filters (both primary and secondary) twice to no avail, on third failure, fuel pressure checked across Winn/Racor secondary fuel filter system and 25inHg restriction noted (almost a total vacuum). Bypassed third party fuel filter and engine has operated fine since.
Outcome...
Winn/Racor fuel filter system is third party system and as such, will not be repaired by Cummins. Cummins maintains that primary fuel filter (FS-1000) is sufficient and additional filter system unnecessary. Removed Winn/Racor system and disassembled. No obstructions found.
Cummins M-11 (450HP)/ Allison HD4060 (6-spd WT)
60,000 miles
1998
Breakdown: THREE in One Month!
Symptoms...
1) The day after taking delivery, drove 450 miles and engine began bucking and stalling and finally slowed to 10 mph and quit.
2) Drove 450 miles and engine would not restart after stop.
3) Drove 450 miles and engine began bucking. Engine would not restart after stop.
Effect...
Unable to get engine to operate normally.
Cause...
It was assumed to be dirty/clogged fuel filters. After changing filters (both primary and secondary) twice to no avail, on third failure, fuel pressure checked across Winn/Racor secondary fuel filter system and 25inHg restriction noted (almost a total vacuum). Bypassed third party fuel filter and engine has operated fine since.
Outcome...
Winn/Racor fuel filter system is third party system and as such, will not be repaired by Cummins. Cummins maintains that primary fuel filter (FS-1000) is sufficient and additional filter system unnecessary. Removed Winn/Racor system and disassembled. No obstructions found.
