electric fuel pump


Information and questions on GL1200 Goldwings (1984-1987)
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maxxx1000
Posts: 18
Joined: Sun Mar 03, 2013 1:11 pm
Location: roswell, nm
Motorcycle: 86 1200 interstate

electric fuel pump

Postby maxxx1000 » Mon Apr 15, 2013 6:48 pm



should the fuel pump stop pumping at any point? mine keeps pumping even at idle. if i clamp down on fuel line it slows way down but keeps going? is this why my gas mileage is so bad?



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virgilmobile
Posts: 7653
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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: electric fuel pump

Postby virgilmobile » Tue Apr 16, 2013 3:46 pm

I assume that you have the original pump.
Pulsing is normal even at a idle...but it usually slows down to 1 pulse every 6 seconds or so...It's trying to maintain about 3 psi on the fuel line.

Now if yours is much worse than that there are 2 possibilities.
Either the valve is leaking inside the pump or a carb(s) float valve isn't sealing very well.
Test....Start the bike and pinch off the line to the carbs.The pump should stop pumping completly as the output pressure maxes out and the pump should stay off.
If it does,the carbs are at fault...If it continues to pump,the internal valves in the pump are leaking.

What kind of gas mileage do you get?? My 84 averaged in the high 30's

maxxx1000
Posts: 18
Joined: Sun Mar 03, 2013 1:11 pm
Location: roswell, nm
Motorcycle: 86 1200 interstate

Re: electric fuel pump

Postby maxxx1000 » Tue Apr 16, 2013 5:30 pm

yes its a orig pump and its pumping about 7 pumps a sec. no change when i clamp off the fuel line to the carbs.. i am not sure of the mileage but i went for a 85 mile ride last weekend and used 1/2 tank of fuel.. it runs very rich at idle. i need to rebuild the carbs i dont know the history of the bike but when i got it home the crankcase was full completely i couldnt tell with what i assumed it was fuel since i cant find any signs of losing antifreeze and it seems to be running ok.

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virgilmobile
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Motorcycle: 1988 GL1500 I
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82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: electric fuel pump

Postby virgilmobile » Tue Apr 16, 2013 6:01 pm

don't get excited about the carbs just yet,a tank or two of Sea Foam my settle them in.Although a sync wouldn't hurt.
About the pump....this is what I'd try first .....Remove the pump from the bike....leave the hoses on it....put. both hoses in a can with Sea Foam and apply 12 volts to it.Let it circulate it for 10 minutes to see If it will clean it up and help seal it's valves.
A half tank(2.5 gal) on just under 90 miles isn't too bad.

maxxx1000
Posts: 18
Joined: Sun Mar 03, 2013 1:11 pm
Location: roswell, nm
Motorcycle: 86 1200 interstate

Re: electric fuel pump

Postby maxxx1000 » Tue Apr 16, 2013 6:42 pm

thx for the info. never used seafoam. who makes it ? and i assume autoparts stores have it?
i synked carbs and it did smooth her out alot. i used to set my old kz carbs on the bench worked great but the gl carbs are very very touchy.

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virgilmobile
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82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: electric fuel pump

Postby virgilmobile » Tue Apr 16, 2013 7:06 pm

Use your favorite cleaner.I'm just hoping there is old fuel varnish on the valve seats that can be cleaned.Yes the carbs are touchy on the sync.just a smidgeon can change the sync from right on to fair.I use a "hydraulic" method rather than gauges.Home built but dead accurate.
Many such designed ideas are on this site.

maxxx1000
Posts: 18
Joined: Sun Mar 03, 2013 1:11 pm
Location: roswell, nm
Motorcycle: 86 1200 interstate

Re: electric fuel pump

Postby maxxx1000 » Fri May 03, 2013 6:47 pm

just got my new fuel pump from babbets. installed it and pumping correctly, quick spin around the block runs good. checked pump again and it was pumping fast like before? closed off fuel line no change then i realized its pumping everytime the coils fire. speeds up with rpm? must be relay at coils right? leave it up to me to get the strange ones...

maxxx1000
Posts: 18
Joined: Sun Mar 03, 2013 1:11 pm
Location: roswell, nm
Motorcycle: 86 1200 interstate

Re: electric fuel pump

Postby maxxx1000 » Sun May 05, 2013 9:03 am

you know when your fuel filter plugs up it will do that ... new filter and it works good.. lol......... :lol:

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virgilmobile
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83 GL1100 I
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84 GL 1200 I

Re: electric fuel pump

Postby virgilmobile » Sun May 05, 2013 9:51 am

The fuel pump relay.
Its a odd device.it monitors one ignition coil.When that coil fires,it also allows current to flow through the circuit.its a safety design,no spark,no fuel.
The pulsing duration of the pump is proportional to the output fuel pressure.
As it fills the carbs,the pressure rises and the pump simply stays full of gas under 3psi of pressure.
Relieve the pressure or starve the pump of gas to pressurize and it will continue to thump away.

highplainsbubba
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Location: Calhan Colorado
Motorcycle: 1986 GL1200 Interstate

Re: electric fuel pump

Postby highplainsbubba » Mon May 06, 2013 8:44 am

You mentioned that you didn't know the previous history of the bike you have so I would suggest resetting the pilot jets. This requires drilling out the plugs that cover them, so removal of the carb will probably be required, unless the plugs have been drilled out previously. The Clymer manual calls for setting the jets to the chart on page 169 . The procedure is on page 154. You may have a bike set to a low altitude setting. I see Roswell is about 4500 feet elevation. The high altitude (above 2,000 feet) setting is leaner. My bike runs well at the 3/4 turns I have on the pilot jets and I live at 6,500 feet. It starts well when warm although when below 40 degrees, I have to run with the choke for a while.

This may not resolve your fuel pump problem (if there is one), but it should help with the mileage.

maxxx1000
Posts: 18
Joined: Sun Mar 03, 2013 1:11 pm
Location: roswell, nm
Motorcycle: 86 1200 interstate

Re: electric fuel pump

Postby maxxx1000 » Mon May 06, 2013 7:49 pm

thanks for the tip... mine is at 1-3/4 turns. i will try leaning it out some.. i am used to running my bikes rich.( air cooled bikes in arizona.)

Mark1537
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Location: Hemet, California
Motorcycle: 1984 GL1200A Aspencade

Re: electric fuel pump

Postby Mark1537 » Fri Aug 28, 2015 2:36 pm

virgilmobile wrote:The fuel pump relay.
Its a odd device.it monitors one ignition coil.When that coil fires,it also allows current to flow through the circuit.its a safety design,no spark,no fuel.
The pulsing duration of the pump is proportional to the output fuel pressure.
As it fills the carbs,the pressure rises and the pump simply stays full of gas under 3psi of pressure.
Relieve the pressure or starve the pump of gas to pressurize and it will continue to thump away.


You say "no spark, no fuel" but my pump starts thumping as soon as I turn the ignition switch on. I'd that bad? Should it not do that?

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virgilmobile
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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: electric fuel pump

Postby virgilmobile » Fri Aug 28, 2015 4:41 pm

Unless the "relay" is bad or the wiring to the pump has been altered,the Safety feature of the bike is to shut the electric pump off if the engine should quit or is not actively being started.
Let's say for the moment,you drop the running bike and kill the engine..in your case the fuel would continue to be pumped to the carbs where they would flood fuel all over the place.Touch a hot exhaust any you can have a fireball right next to you.

So yes...the fuel pump should quit when the engine quits running...this is normally controlled by either the lack of spark or from the ignition module.
Many bikes do have a "self test" mode that cycles the fuel pump,but it usually has just a 2 second live time.
I don't think the carb type 1200 uses this.




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