Fuel pump


Information and questions on GL1200 Goldwings (1984-1987)
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poffutt
Posts: 53
Joined: Fri Jan 27, 2012 9:22 am
Location: Houston, Texas
Motorcycle: 1984 Goldwing Interstate GL1200

Fuel pump

Postby poffutt » Sat Feb 25, 2012 4:43 pm



I have some questions as to how the fuel pump works.

1. When you turn the key on, should the pump start pumping?
2. I hooked my pump straight to the battery just to test it. It runs weak and when you plug up the out hole the pressure makes it stop. Is this correct?

Tell me all you can about this if you know. I am trying to start my bike with all the plastic Faring, seat everything. The pump will not pump while the bike is all striped down. What am I missing?



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WingAdmin
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Re: Fuel pump

Postby WingAdmin » Sat Feb 25, 2012 6:00 pm

I believe the ignition module only turns the fuel pump on when it requires it (i.e. when engine is running).

Looking at the schematic, you can pull the fuel pump relay, and use a jumper (paper clip, etc) to short the white and black terminals at the relay connector. Turn the ignition switch on, and the fuel pump should then run.

The fuel pump is not a high-pressure pump, as the bike is not fuel injected and doesn't require it. It should flow about two cups of fuel per minute.

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virgilmobile
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Re: Fuel pump

Postby virgilmobile » Sat Feb 25, 2012 9:52 pm

The pump is a pulse type.When about 3 psi is reached on the line the internal spring won't allow it to cycle again.It is tested not only with pressure but flow.
So,yes to all....With no fluid,powered direct it will thump about 3-4 times a second.As it pressures up with fuel,the pulsing stops.
Yes,it is ignition pulse controlled.It gets it's power from the above mentioned relay ONLY when the engine is cranking or running.

poffutt
Posts: 53
Joined: Fri Jan 27, 2012 9:22 am
Location: Houston, Texas
Motorcycle: 1984 Goldwing Interstate GL1200

Re: Fuel pump

Postby poffutt » Sat Feb 25, 2012 11:29 pm

Okay sounds like my pump works ok, but I guess the question I have is this. When I turn my key on, should I be able to read 12 volts at the wire connected to the pump? Or is something putting power to it after the engine starts? I know alot of bikes do not turn on the lights until the engine cranks up to keep more power to the starter. Is this the case with my 84 1200 Goldwing?

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virgilmobile
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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 pump

Postby virgilmobile » Sun Feb 26, 2012 11:29 am

The pump gets power from a relay which is operated by the ignition control module.Just turning the key on,there won't be 12 volts on the pump,only while cranking or running.
The headlights are powered through the start button,when you push the starter button it will turn off the headlights while cranking.Otherwise,the headlights and park lights come on with the key.

poffutt
Posts: 53
Joined: Fri Jan 27, 2012 9:22 am
Location: Houston, Texas
Motorcycle: 1984 Goldwing Interstate GL1200

Re: Fuel pump

Postby poffutt » Sun Feb 26, 2012 4:06 pm

Okay thanks for your info. One more time even though it was answered. I am in the middle of a striped down bike. All faring and plastic is off. I want to run my bike so I can tune, change belts, clean etc with all the plastic off. I am getting fire but no gas. I am not getting power to my fuel pump. I am assuming because all the fairing wires are unpluged.

Will it be okay for me to hook the fuel pump up direct to the battery so I can do my work and then when I put all the plastic back on it should work as normal. What I don't want to happen is burn my fuel pump out because it will be trying to work when the floats in the carb are not letting fuel in?

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virgilmobile
Posts: 7650
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 pump

Postby virgilmobile » Sun Feb 26, 2012 4:37 pm

The pump shuts itself off when the pressure is reached,so no worries there.




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