Non OP 1984 Interstate Fuel Pump, Help


Information and questions on GL1200 Goldwings (1984-1987)
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warmblood58
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Non OP 1984 Interstate Fuel Pump, Help

Postby warmblood58 » Wed Nov 26, 2014 9:46 pm



Hi Folks, picked up a project 1984 Goldwing - am I correct in assuming that fuel pump will make it's presence known when ignition turned on? I have a no battery but I do have one of those 12 volt jump boxes and all panel lights came on with that but no pump humming, is this normal? I removed false tank and checked fuses in fuse box - all fine. Where is the fuse for the FP located and relay on the 84 Interstate? I did remove FP and cleaned badly burned points hoping that would do it but no dice? Could it be that the electrical system needs more juice from an actual battery versus a jump box which I would think would provide enough juice to operate an FP. Help! Thanks!



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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby HALBUDD » Wed Nov 26, 2014 10:56 pm

If I remember from other posts the pump on an 84 wont come on until the bike is running, but you can test the pump with a battery by hooking it up to the battery only. Take the fuel line that feeds the carbs off and put it in a jug so if the pump is working it should pump gas in to the jug. Warning be careful with any sparks around the fuel dont want any fires. And you should get a good battery for the bike and dont try to start it with a jump set up as it wont be enough power to start the bike and could cause an over spike frying your electrics. good luck--------------------Hal
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warmblood58
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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby warmblood58 » Thu Nov 27, 2014 12:14 am

HALBUDD wrote:If I remember from other posts the pump on an 84 wont come on until the bike is running, but you can test the pump with a battery by hooking it up to the battery only. Take the fuel line that feeds the carbs off and put it in a jug so if the pump is working it should pump gas in to the jug. Warning be careful with any sparks around the fuel dont want any fires. And you should get a good battery for the bike and dont try to start it with a jump set up as it wont be enough power to start the bike and could cause an over spike frying your electrics. good luck--------------------Hal


Aha! Thanks! yea, I was not going to start bike on jump, just using the jumpbox to see if FP would come on. I'll attach leads to FP and see what happens, thanks again!

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby HawkeyeGL1200 » Thu Nov 27, 2014 6:53 pm

I'm fairly certain that the fuel pump relay won't pick up unless there is "rotation" of the engine. The fuel pump won't hum like the fuel pump in a car. It "clicks" when it operates. You can put your hand on it and feel it cycling. Some click loudly enough you can hear them, but that is generally considered to be a bad sign. Mine made a lot of noise when I bought it, and lasted about 8 months before it bit the bullet. There are some aftermarket fuel pumps that can be used as more or less direct replacements. If memory serves me correctly, a 1990-ish honda accord pump is one of them... New OEM Honda fuel pumps can be had for these bikes, but are scarce now.

You can put 12 volts directly to the pump and test it to see if it flows properly. somewhere near 17 ounces per minute is what they're supposed to flow with no restriction on the outlet.
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby warmblood58 » Fri Nov 28, 2014 1:16 am

Thanks Hawkeye, good to know!

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby warmblood58 » Fri Nov 28, 2014 11:20 pm

Anyone know where the fuse and relay for the fuel pump are located for the 1984 Interstate? Thanks!

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby virgilmobile » Sat Nov 29, 2014 12:02 pm

I don't believe there is a seperate fuse for the pump.The relay is powered from the same line as the ignition coils(from the kill switch)...if there is no spark there will be no power for the pump.
The pump control "relay" is located in front of the ignition coils.Hard to see it.
Also there will be volts going to the pump ONLY if the pump works and voltage is there only as the pump draws power.
In a operational system,if you measure the output from the "relay" volts only appear when the pump pulses.it is not a continuous power output.
It will also only have power avaiable when there is sparking going through the coils.
The engine must be cranking or running.
Test the pump first by applying power direct to it. It has a pressure switch in it.when the pump holds around 3 psi on the outlet,the switch stops the pump.Open discharge and the pump should pulse about 3-4 times per second.When the pressure builds the pump will simply stop.

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby warmblood58 » Sat Nov 29, 2014 5:54 pm

Thanks, great information! I filed pump points and dislodged small spring in FP by accident and reinstalled spring but unsure of my reinstallation - my belief is a small c clip fits on center shaft which helps orient the spring but I see no clip - does anyone have a exploded parts diagram of the fuel pump so I can determine if my suspicion is correct? Thanks, might be time for Honda Prelude Pump substitution.

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby virgilmobile » Sun Nov 30, 2014 2:33 pm

There a picture in my post.hope it helps...viewtopic.php?f=12&t=8642

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby warmblood58 » Sun Nov 30, 2014 5:22 pm

Thank you! So it appears that groove on plunger rod does not have a c clip - I found obvious mounting point for spring on points side but where does spring mount towards plunger rod side? Thank you!

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby virgilmobile » Sun Nov 30, 2014 7:09 pm

I'm going from memory.i think the spring sets between the switch and a pivot bar.every time the pump strokes it clicks the switch.

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby warmblood58 » Sun Nov 30, 2014 9:13 pm

virgilmobile wrote:I'm going from memory.i think the spring sets between the switch and a pivot bar.every time the pump strokes it clicks the switch.


Right now, I have one end of the spring resting against the plunger rod which would surely upset the spring I would think upon movement - when I look at your pic up close, it appears there is something else supporting the spring - probably the little tiny "clink" I heard when it hit the ground/pan . . . . oh boy . . . .

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby Old Fogey » Mon Dec 01, 2014 2:30 pm

The pump is made by Mitsubishi and used, with many variations of the inlet and outlet pipes, on a huge number of carbs bikes from the 80s and 90s. The one I have on mine fits a 94 600 Kawasaki.

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warmblood58
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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby warmblood58 » Sun Dec 07, 2014 11:11 pm

OK, so fuel pump is not working but bike runs! I fed the carbs via a 2 foot section of fuel line and a funnel but . . . bike would not rev in spite of a very smooth idle, engine would die upon opening throttle - is this because there is no fuel pressure due to the non working fuel pump?

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby virgilmobile » Mon Dec 08, 2014 8:07 am

Good possibility that there's not enough fuel getting in for revving the engine.to simulate the fuel pump pressure needed to keep the carbs full,you would need to raise the gravity fed fuel supply to around 6 feet above the carbs.
2 foot might give you a bit less than 1 psi.

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby HawkeyeGL1200 » Mon Dec 08, 2014 8:31 am

I'd suspect that there is other trouble than fuel pressure at work here. VirgilMobile is certainly correct in his comment about raising the source of the static fuel supply higher, if you want to get more pressure at the carbs. Every foot you raise the reservoir will add about 0.44 PSI at the low point of the outlet hose to the carbs.

The carburetor doesn't depend on fuel pressure to push fuel through the jets, however, and as long as the proper level of fuel is maintained in the bowl, the carb should work okay. The situation you describe of idling properly and not revving as you would like would seem to be caused by the sliders not working together, the carbs not in synch, a vacuum problem or a combination of them all. Even though you're increasing the RPMs of the engine, you've introduced almost no load on it... and if it is running poorly on the center stand, it surely won't like it when you start to make it do work.

There's always the other possibility, that I'm completely wrong LOL... but that's where I am based on the description of how your engine runs... The good news is, it sounds like your slow speed jets are clear... You may try to synchronize the carbs as they are, and maybe, just maybe it will run better under load... but I am not optimistic of that outcome.
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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Re: Non OP 1984 Interstate Fuel Pump, Help

Postby warmblood58 » Mon Dec 08, 2014 12:16 pm

Thank you gentlemen, good information. I think I will buy a airtec pump today (prelude type) and use this as a starting point. I need to check for vaccum leaks and did not check aircleaner as I should especially with evidence of mice - might be as simple as no air intake. I will most likely keep airtec as a backup pump for the road and reinstall a new oem honda pump. Wish me luck! Note: Five days of seafoam in bowls left fluid with a slight gold cast (varnish) but nothing else I suppose when I pull aircleaner I can shoot some carb cleaner from above and see what effect that may have.




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