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I have a 1981 GL1100 Interstate, last year while going up the passI lost power and it acted like it was starving for fuel, I could back off the throttle and it would run fineI would get back on the throttle and seconds later lose power again. checked fuel filter and gas cap vent fuel flowing fine to the pump. pressure tested at 2lbs and the flow was17oz in a min.

this year the problem is slowly progressing now ifI get on the throttle and go through the grearsI can experiance the same problemby the timeI hit high gear. IfI back off of it and get back on the gas it takes a while then the same old thing.

today after a nice ride (and having the same old problem)I re-tested the pumpI now have 1.5 lbs at idle and it drops to 1 lbs at 5000 RPM. so I put a long hose on the gauge had the wife on the back reading the gauge. whenI would go through the gears and the sputtering started the gauge was reading 1lbs whenI backed off the gas the gauge would read 1.5.

nextI found a long hill asI started upI would slowly increase the gas to maintain speed and thepresure would drop to 1 lbs and the sputtering started.got home checked the flow still 17 oz in a min. fuel flows freely to the pump spark plug look good.vacume advance is working

had the pump a part looks good and clean. now it's your turn HELP.
what gives up on these pumps they appear to be a simple pump.
 

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Your pressure is about 1/2 what it should be but the volume is good. I suppose the check valves not seating good could cause the lack of pressure.
 

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95% of the time what gives up on the pump is the rubber diaphragm. When it does, and you don't have the weep hole plugged, is it will spit gas out the top of the pump.

I would find a good, used cheap pump to try and see if that is your problem. A brand new Honda pump is around $70 these days. If you shop right.

Right now I don't have a good used one, I've had to replace the pump on 2 of my bikes.
 

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you could go see your local auto parts store for a low pressure electric pump.Leave your mechanical pump in place to keep the engine buttoned up, Just remove the pump arm off of it so it does not keep pumping. That would fix your problem.
 

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Hatchetman,
Nice Idea. I would believe the rubber diaphram in the fuel pump is slowly going bad.
David
 

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DaveO430 wrote:
Your pressure is about 1/2 what it should be but the volume is good. I suppose the check valves not seating good could cause the lack of pressure.
or weakened springs.. stretched diaphram..
 
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