bike will only run if tank is pressurized


Information and questions on GL1100 Goldwings (1980-1983)
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honky4fun
Posts: 3
Joined: Tue Jul 22, 2014 2:09 pm
Location: Camby In
Motorcycle: 1981 Honda GoldWing GL1100 Interstate

bike will only run if tank is pressurized

Postby honky4fun » Wed Apr 15, 2015 7:12 pm



I have an 81 gl 1100. It will only run if I pressurize the fuel tank. And then it still runs like crap kinda like its running out of gass. Switching to the reserve makes it worse. I checked the pitcock and it is as clean as new. Where should I start looking for a problem?



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SteveB123
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Location: Winchester, Ontario, Canada
Motorcycle: 1982 1100I, 60A Poorboy, MSD coil

Re: bike will only run if tank is pressurized

Postby SteveB123 » Wed Apr 15, 2015 7:47 pm

Change the filter.
Check the fuel pump.
Check the lines for (air) leaks upstream of the pump.
Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing

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Aussie81Interstate
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Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: bike will only run if tank is pressurized

Postby Aussie81Interstate » Wed Apr 15, 2015 8:15 pm

Clean the carburretors

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RBGERSON
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Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: bike will only run if tank is pressurized

Postby RBGERSON » Thu Apr 16, 2015 8:04 am

clean out the lines in the tank run a speedo cable into them..on a drill, check the screens for clogs, fuel filter, fuel lines, rebuild/clean carbs. You could try spraying gas into the plenum and she if she perks up..then you know for sure it a fuel issue. Just be careful not to start a fire.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

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WingAdmin
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Re: bike will only run if tank is pressurized

Postby WingAdmin » Thu Apr 16, 2015 8:59 am

Does the bike run better if the tank is full? The bike will (should) actually run without a fuel pump if the tank is full, as it will gravity feed. I would suspect fuel filter or fuel pump. Change the filter first and see if it makes a difference.

honky4fun
Posts: 3
Joined: Tue Jul 22, 2014 2:09 pm
Location: Camby In
Motorcycle: 1981 Honda GoldWing GL1100 Interstate

Re: bike will only run if tank is pressurized

Postby honky4fun » Thu Apr 16, 2015 5:40 pm

It don't matter how much gas's is in it. if I pressurized tank the gas will flow threw the pitcock easy once I switch to the reserve or vice a versa all fuel stops

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spiralout
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Motorcycle: 1975 GL1000 (gone)
1980 GL1100I (with '77 1000 engine)
1996 GL1500 SE

Re: bike will only run if tank is pressurized

Postby spiralout » Thu Apr 16, 2015 6:01 pm

Sounds like a petcock problem or clogged pickup tube/screen to me. Do you get any flow through it when taking off the line without pressurizing the tank? If not, there's your problem.

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80Winger
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Motorcycle: 1980 GL1100

Re: bike will only run if tank is pressurized

Postby 80Winger » Sat Apr 18, 2015 10:52 pm

Try removing the supply line from the pump. Then remove the fuel tank camp with a vessel to drain fuel into. With the petcock open, fuel should drain freely into your jar/can.

If that isn't happening, then using compressed air, either from your compressor or a dust cleaning can, blow air BACK into the supply line with the petcock open and the fuel tank cap off. You should hear bubbles emitting inside the fuel tank. Do this for 5-10 seconds. Then reconnect everything and see if things improve. Don't use 125 PSI to do this, 10-15 PSI should be sufficient.

If the situation improves: It's temporary and sediment around the pickup screen of the petcock was temporarily cleared by the bubbles and air pressure blowing back into the tank. As soon as the sediment works it way back down to the pick up, the fuel flow problem will return.

If the situation did NOT improve, even temporarily: Your problem lies elsewhere and likely in one of the spots already mentioned in previous posts.




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