'84 Aspencade fuel pump - thought I fixed it, but I was wrong


Information and questions on GL1200 Goldwings (1984-1987)
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Buddykitchen
Posts: 4
Joined: Sun Mar 23, 2014 7:28 pm
Location: Fountain Inn, SC
Motorcycle: 1984 GL1200 Aspencade

'84 Aspencade fuel pump - thought I fixed it, but I was wrong

Postby Buddykitchen » Wed Jun 29, 2016 7:22 pm



Tried the pump repair method from the GL1200 DIY section - http://goldwingdocs.com/forum/viewtopic.php?f=12&t=8642

Before the pump was taken apart, it was ticking loudly but still pumping. Once it was put back together, the pump only cycles once per application of power (it doesn't cycle like the testing procedure indicates). For grins and giggles, I installed it on the bike, but it only thumps once every time I turn on the ignition. If I try to crank the engine, all the pump does is get hot.

Since I'm not really well-versed on electronics (or fuel pumps, for that matter), can someone shed some light on what the issue may be that causes the pump to behave this way? I don't want to crack it open again without at least a hint of what to look for.



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twocams
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Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
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Re: '84 Aspencade fuel pump - thought I fixed it, but I was wrong

Postby twocams » Wed Jun 29, 2016 8:33 pm

Why dont you just junk that 35 yr old pump and buy a new one? Sometimes they just cant be saved. I got one new off ebay for about $25 works great. Does it have chrome on it? No, ask me if I care. If that's all people have to look at on a nice bike. Will it last 35 yrs? I dont know cause I wont be riding that long.

twocams

Buddykitchen
Posts: 4
Joined: Sun Mar 23, 2014 7:28 pm
Location: Fountain Inn, SC
Motorcycle: 1984 GL1200 Aspencade

Re: '84 Aspencade fuel pump - thought I fixed it, but I was wrong

Postby Buddykitchen » Thu Jun 30, 2016 3:02 am

Because I don't have a disposable mentality, and I see value in trying to rebuild the pump if possible.

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virgilmobile
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Re: '84 Aspencade fuel pump - thought I fixed it, but I was wrong

Postby virgilmobile » Thu Jun 30, 2016 7:07 am

At the end of the pump there's the switch that energizes it.If it does not open,the coil will get hot.
When the pump is energized,it pulls the plunger..the rod that the plunger is attached to pushes on the switch assembly and opens the contacts....until fuel pressure drops allowing the switch to make contact again.
The switch should be closed when there is no fuel pressure.When the pump thumps (cycles) the switch contacts should open about 1/4 of the way into the stroke.

Buddykitchen
Posts: 4
Joined: Sun Mar 23, 2014 7:28 pm
Location: Fountain Inn, SC
Motorcycle: 1984 GL1200 Aspencade

Re: '84 Aspencade fuel pump - thought I fixed it, but I was wrong

Postby Buddykitchen » Thu Jun 30, 2016 9:17 pm

Found the problem. There's a grove machined into the plunger shaft, and this grove should lock in with one of the moving arms on the switch. That way, when the plunger is drawn up, the moving arm moves up and the switch is properly activated.

That arm wan wasn't locked into the grove on the plunger shaft, so when the plunger was pulled up, the points on the switch never made contact. As a result, the electromagnetic coil would sit there constantly energized, generating heat.

And there's why I didn't want to buy another pump. This one was easily repaired. Thanks for the explanation, Virgilmobile. :D

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virgilmobile
Posts: 7663
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: '84 Aspencade fuel pump - thought I fixed it, but I was wrong

Postby virgilmobile » Fri Jul 01, 2016 12:28 pm

Yes indeed.your getting good at this. :D




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