Fuel not pumping


Information and questions on GL1500 Goldwings (1988-2000)
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arrowhead_40
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Joined: Sun Jul 12, 2015 10:47 pm
Location: Braxton, MS
Motorcycle: 1988 GL1500

Fuel not pumping

Post by arrowhead_40 » Wed Oct 03, 2018 1:25 pm



While on a bike ride in the mountains, my bike died going down a mountain. When I started checking after I pulled off the road , I discovered the fuel filter dry. There was 1/4 tank of fuel. I had been banking in the turns but had no trouble up until this happened. I thought possibly the bank angle sensor went out. I bypassed the petcock and still would not fire. Pulled fuel pump relay and not getting power to it when key is on or when pushing started button. Direct wired the fuel pump and it is pumping. Any suggestions?



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WingAdmin
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Re: Fuel not pumping

Post by WingAdmin » Wed Oct 03, 2018 1:57 pm

This one is pretty easy.

Here's the 1500 fuel tank:

GL1500 fuel tank
GL1500 fuel tank

The fuel cap on the right side is at the front of the tank. That hole at the back of the tank is where the fuel pump and pickup are. The fuel level gauge is mounted at the front of the tank.

When you have 1/4 tank left, and you are pointed downhill and braking, the gas sloshes to the front, the fuel pickup starts sucking air, and you "run out of gas."

Point the bike back uphill and you'd find it magically comes back to life.

And incidentally, being that the float mechanism is near the front, you probably actually had a lot less than 1/4 tank left.

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virgilmobile
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Re: Fuel not pumping

Post by virgilmobile » Wed Oct 03, 2018 2:41 pm

Uhhh...right now you can get it to pump fuel with a bypass to power and the pump relay does not have power..Correct?
I'll bet 26 cents that there's no spark either...First the "fuel pump relay" gets power from the same wire as the ignition system.
The bank angle sensor trips a relay that provides power to the ignition.
The kill switch is also thrown into the mix.
See if it's got spark first.



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virgilmobile
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Re: Fuel not pumping

Post by virgilmobile » Wed Oct 03, 2018 2:52 pm

Also..the bank angle sensor activates relay #8 when the key is turned on..Fuse#3 provides power for the circuit..Did I also mention that the power goes through the kill switch??

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virgilmobile
Posts: 8642
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Fuel not pumping

Post by virgilmobile » Wed Oct 03, 2018 3:04 pm

One more thing.You can bypass the bank angle sensor by unplugging it and shorting the green to the red/white wire.
This completes the circuit to get the relay to operate.Do not short the white wire to ground..it will pop the fuse.



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