Fuel Pump


Information and questions on GL1200 Goldwings (1984-1987)
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Poohman
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Joined: Fri Oct 21, 2011 8:55 pm
Location: Deltona, FL
Motorcycle: 1985 GL1200A Apsencade
1998 GL1500 SE

Fuel Pump

Postby Poohman » Sat Dec 03, 2011 2:30 pm



I was wondering if anyone could verify what I think might be wrong with my GL1200 Aspencade. At first I thought it was the coils or pulse generator but now I think the fuel pump is not working correctly. The front cylinders were not firing and that was making me think it was the coils or the Pulse Generator but today I was taking the wing apart so i could check the voltage or Ohms on the coils. To my supprise I was looking at the fuel filter and it did not look like the filter was filling up with fuel, afer i took the hose off the out going side of the fuel filter i started up the wing and it looked like it was just spuddering out gas, not a flow. I then took off the hose to the on/off valve and the gas was flowing out nicely. Then I took the hose to the inlet side of the fuel filter and put my finger over the inlet nipple to the fuel filter and it does not seem to be pulling a good vacum. then I put the hose back on and turned on the wing and it seemed to run better and the front cylinders seem to be firing. Could this mean that the fuel pump was just getting enough gas to the back cylinder which are first in line for gas, and the front cylinders were not getting gas?



harkgold
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Motorcycle: 1984 GL1200 Interstate

Re: Fuel Pump

Postby harkgold » Mon Dec 05, 2011 5:50 pm

How old is the fuel filter?
Harkgold

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Poohman
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Joined: Fri Oct 21, 2011 8:55 pm
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Motorcycle: 1985 GL1200A Apsencade
1998 GL1500 SE

Re: Fuel Pump

Postby Poohman » Mon Dec 05, 2011 7:37 pm

The fuel filter is only 2 months old. and it is a clear body where I can see the gas flowing through it. When I changed it I noticed that the fuel was almost completely filling the body of the filter. Now it looks like an 1/8" of gas in the bottom of the filter. Is the fuel pump on a standard carb goldwing set to the pulse generator and should the pump flow gas through it or just spit gas out ever second?

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artgrantz
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Re: Fuel Pump

Postby artgrantz » Tue Dec 06, 2011 8:28 am

The pulse generators enable the fuel pump but do not pulse it, and only one of them does that.
If you can find an inexpensive electric fuel pump at an auto parts store you can rig it up and see if the bike runs. I made a trip to California and back that way when my fuel pump died just before the trip. Just be sure to get a fuel pump with a low pressure for a carb vehicle. Fuel pumps for fuel injection will force fuel past the seals.
Good luck.

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Poohman
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Motorcycle: 1985 GL1200A Apsencade
1998 GL1500 SE

Re: Fuel Pump

Postby Poohman » Tue Dec 06, 2011 7:37 pm

Thanks artgrantz, I had a friend at work loan me a small low volume electric pump for small gas engines for 4, 6, & 8 cylinder engines. I am going to try it and see if it works. I am just wondering if I should hook up the 12 volt pump to my battery charger or should I plug it in to the connector for the fuel pump. My thoughts are my battery charger has an off/charge switch which I could start the wing and then turn on the charger and see if it works. Would this be good or not?

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artgrantz
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Re: Fuel Pump

Postby artgrantz » Tue Dec 06, 2011 8:08 pm

Poohman, I guess the charger might work or you could just use jumper cables to connect to a car battery. I knew my pump was bad so I cut the plug off of it and attached it to the new pump.
I hope it works for you.

harkgold
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Location: Des Moines, Iowa
Motorcycle: 1984 GL1200 Interstate

Re: Fuel Pump

Postby harkgold » Tue Dec 06, 2011 8:55 pm

artgrantz wrote:Poohman, I guess the charger might work or you could just use jumper cables to connect to a car battery. I knew my pump was bad so I cut the plug off of it and attached it to the new pump.
I hope it works for you.


Artgrantz, was the pump you replaced the original fuel pump? And just curious to know how many miles did you get out of the pump before it died on you.
Did you bench test the pump in order to determine if it was a bad pump, or did you determine that by process of elimination of other parts?
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artgrantz
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Re: Fuel Pump

Postby artgrantz » Tue Dec 06, 2011 9:16 pm

We disconnected the output hose, and fuel came out only in small spurts, so we knew the pump was bad. I assume it was the original, I bought the bike used. Don't remember the mileage, it was too long ago.

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virgilmobile
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Re: Fuel Pump

Postby virgilmobile » Tue Dec 06, 2011 11:38 pm

It is a pulse type pump.It's suppose to do that.the service manual shows the test procedures for volume and pressure test.Pressure gauge the output for 2.5psi and then open discharge to a can to measure the volume.




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