Fuel delivery problems?
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Road Captain
Joined: Nov 2014
Posts: 680
Likes: 224
From: Buhl, Idaho
Fuel delivery problems?
Okay. Bike is an '08 FLHT with a cubic buttload of miles on it. Stage 2, with a Power Commander 6. Riding a few days back, bike ran fine. Plenty of power, responsive throttle. Bike bucked once and the engine stopped. Half tank of fuel. Good battery, etc. Get the bike home, pull the tank top cover off to check for a bad hose. Sure enough, one was blown out. Fuel pump was aftermarket, so a bit questionable as to reliability. Replaced it with a factory fuel pump. Installed new filter. ( old one still looked pretty good).Bike starts and idles. As soon as I blip the throttle, it dies, like out of fuel. Then hard to start, and doesn't idle very well. I've removed the main fuel line (the one with the quick release fitting) and determined there was no blockage. Removed the fuel pump again, checked THOSE hoses, could find no holes or blockages. The bottom fuel pump filter is almost new. Housing for the filter is good, no cracks, and is seated properly. When I disconnected the fuel line at the quick disconnect, there was pressure. And when I disconnected the hose from that point to the fuel pump, there was also pressure. I checked the wiring for the throttle body, and found no problems. Disconnected the PC6, plugged in the stock ecm, no difference at all. Blip the throttle, and it quits. At a bit of a loss as to what to check next. Open to constructive suggestions here.
Road Master
Joined: Jan 2020
Posts: 856
Likes: 373
From: Duke City, NM
You replaced a lot of stuff at one time, maybe a new part is bad. Not likely but not unheard of.
you did upstream items, I’d test pressure and if good, I’d move downstream. It doesn’t take much to clog a jet or injector.
you did upstream items, I’d test pressure and if good, I’d move downstream. It doesn’t take much to clog a jet or injector.
Did you replace the regulator while you were in there ?
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Road Captain
Joined: Nov 2014
Posts: 680
Likes: 224
From: Buhl, Idaho
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Road Captain
Joined: Nov 2014
Posts: 680
Likes: 224
From: Buhl, Idaho
Other than the fuel pump, everything else I replaced was simply a maintenance thing. I've done it many times in the 150,000 miles I've put on it since new.
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Road Master
Joined: Jan 2020
Posts: 856
Likes: 373
From: Duke City, NM
Thread Starter
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Road Captain
Joined: Nov 2014
Posts: 680
Likes: 224
From: Buhl, Idaho
alligator clips and wire. The pump only has two terminals. Power and ground, as it is mounted in plastic. I hooked them up while the pump was immersed in a bucket of water. No sparks to worry about. As soon as I touched the wire to the positive on the battery, the pump did its thing, and pumped the water .I don't yet have the means to test the line pressure, but am looking into that. Fair questions. Ones I've already asked myself.