Question about 2006 Harley Davidson FLHRS Road King Custom

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What should I check next? Not getting any error codes, replaced the CKP, MAP, IAC, TP, & ET Sensors. Not sure what I should try next, any suggestions would be appreciated.

Bike starts great and after 1 minute the bike starts to sputter from intake and then stops running, if I restart it starts fine again for a minute and starts sputtering again. I filled up and went about 20 miles after the sputtering started.

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If no DTC's are recorded, then it is most likely to be a fuel problem. You need to check the fuel pressure with engine running and this requires specialized test equipment. You need a gauge that can connect into the fuel line. Running pressure should be around 55 - 60 PSI. If the bike starts and runs ok for a minute, it is not bad gas. Bad gas is just that, bad gas. It will not burn correctly and the first thing noticed is hard starting. I assume the bike is fuel injection. If it has a carburetor then I would be checking the fuel flow as this symptom sounds like carb is running out of fuel. Dirty gas, fuel with debris in it. The petcock will be vacuum operated and if it has a leak, (on carb models), fuel flow will be affected. Also, the tank vent if blocked will affect fuel flow. Remove the fuel line from the carb, put end into a fuel safe container to stop fuel pouring all over the place generating a fire hazard, apply suction to the vacuum pipe on the rear of the petcock and you should have a good fuel flow. If you don't, then the fuel filter inside the tank on the petcock is blocked or the vacuum part of the petcock is faulty.

Posted on Mar 29, 2015

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Hi Bruce, might have gotten some bad gas. Drain the tank, clean the fuel filter, check the bottom of tank for rust, dirt, water ect. Then ckeck fuel pump pressure, refill tank with a gallon of fresh gas from a different source and take it for a ride. good luck

Posted on Mar 28, 2015

  • Rick Burton
    Rick Burton Mar 30, 2015

    agree with above, you could try a bit of fuel stabilizer in case water got in there.


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