massive fuel consumption


Information and questions on GL1100 Goldwings (1980-1983)
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Chitownjohnny
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Motorcycle: 1981 GL1100

massive fuel consumption

Post by Chitownjohnny » Tue Jul 30, 2019 3:26 pm



Ok carbs rebuilt somehow I got my 81 gl1100 running. Took it out for a ride to work 35 miles and used 3/4 a tank of gas! Since it is not the cabs and I do smell gas from the motorlike it's dumping fuel in what can it be? Speed is good now and I averaged 60 mph. Fuel pump? New throttle cables? Bad spark? Any suggestions please.



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DenverWinger
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Re: massive fuel consumption

Post by DenverWinger » Tue Jul 30, 2019 5:09 pm

If you don't find fuel leaking outside the engine check inside. The fuel pump diaphragm may have a pinhole allowing fuel down the fuel pump actuating lever, draining into the head and ultimately into the oil. Quick check is see if your oil looks overfilled and smells like gas....

Not sure but I think fuel pump parts are still available....
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

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dingdong
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Re: massive fuel consumption

Post by dingdong » Tue Jul 30, 2019 5:38 pm

Famous last words: "The carbs were rebuilt." There are almost no qualified GL carb re-builders. Chances are very good that whoever did the rebuild missed something. For instance exact float adjustments. They are critical, close doesn't count. That is just one possibility. Pull and check the plugs. Probably black and sooty.

Chitownjohnny
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Re: massive fuel consumption

Post by Chitownjohnny » Tue Jul 30, 2019 6:17 pm

Carbs were rebuilt and tested by pistol Pete's do I trust the work. I think it is my fuel pump

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WingAdmin
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Re: massive fuel consumption

Post by WingAdmin » Tue Jul 30, 2019 7:06 pm

With that amount of fuel being used, if it was a leak, you would be smelling it. So it's getting burned, which most likely means one of two things:

- Fuel pump is massively - and I mean MASSIVELY overpressurizing the fuel system
- Float valves leaky/incorrectly set

Being that you just had carb work done, the probability of it being the second one is going to be pretty near 100%.

Chitownjohnny
Posts: 30
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Location: Montello, WI
Motorcycle: 1981 GL1100

Re: massive fuel consumption

Post by Chitownjohnny » Tue Jul 30, 2019 7:23 pm

Could it be pumping out the weep hole if the diaphragm had a rip or tare.

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WingAdmin
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Re: massive fuel consumption

Post by WingAdmin » Tue Jul 30, 2019 7:26 pm

One other thing to check: Have a look at your oil level, make sure it is correct, and that your crankcase isn't full of fuel.

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pidjones
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Re: massive fuel consumption

Post by pidjones » Tue Jul 30, 2019 9:23 pm

I'm thinking bad fuel gauge or fuel pump. Pistol Pete runs every carb rack on a test engine before shipping. Plus, if that was going through the engine your plugs would be fully fouled.

Chitownjohnny
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Re: massive fuel consumption

Post by Chitownjohnny » Tue Jul 30, 2019 9:35 pm

Thank you I know it can't be the gauge because I put 4.5 gallons in when I finished and filled when I started. The consensus is leaning toward the fuel pump.

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ekvh
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Re: massive fuel consumption

Post by ekvh » Wed Jul 31, 2019 6:04 am

If the shipper tossed the box of carbs around roughly it could easily knock the float settings off. So Pete could have tested them and they ran good on his test engine, but got to you out of spec. It would take a pretty good drop of the box, but I think I recall a set of 1100’s this happened to. Not too difficult to check float heights.

I would think a whiff of the exhaust would tell you it’s rich.

Chitownjohnny
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Re: massive fuel consumption

Post by Chitownjohnny » Wed Jul 31, 2019 8:34 am

Pulled the plugs they look normal almost new no soot. If I had a bad float would they not be sooty since they would be burning excessive amounts of fuel?

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DenverWinger
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Motorcycle: (s)
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: massive fuel consumption

Post by DenverWinger » Wed Jul 31, 2019 5:55 pm

Did you check the oil?


♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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