fuel issues


Information and questions on GL1200 Goldwings (1984-1987)
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Tomcomox
Posts: 8
Joined: Thu Jul 29, 2021 10:21 am
Location: Courtenay,British Columbia,Canada
Motorcycle: 1984 GL1200 Aspencade ( Aug. 2021 )
1999 Honda Magna 750
1977 BMW R75/7

fuel issues

Post by Tomcomox »



Good day Ladies and Gents,

1984 Gl1200 Aspencade, 93 ,200 kms, new to me August 2021, turned over wouldn't start.

I'm not going to bore you with ALL the work I've done thus far, thanks to this forum and others like it but I'm moving along...except.

I'm not getting the bike to start when it's all hooked up. It starts and runs when I bypass pump ie: jerry can to carbs direct, bike starts,runs nicely, even synchronized the carbs this way. When I hook everything back up the bike won't start ? Have fuel coming out of pump, so from tank - line - filter - pump is good, disconnected fuel line at # 3 carb, fuel came out. What I'm I missing ....?

Carbs rebuilt, tank, petcock, sender cleaned, all new fuel lines, filter, relay, fuel pump. I know enough to be dangerous when it comes to mechanics, joined the Canadian Air Force in 1979 AirFrame Tech ( helo mechanic ) 5 yrs, have owned 2 motorsailers up to 40 ft and had numerous boats and bikes, so I like to wrench abit.

Any advice / guidance would be greatly appreciated. Thanks.

Tom


joecoolsuncle
Posts: 113
Joined: Sun Sep 26, 2021 6:10 am
Location: oxford, ar
Motorcycle: 1984 gl1200a

Re: fuel issues

Post by joecoolsuncle »

fuel pumps are cheap. its old. you probably need one,
Tomcomox
Posts: 8
Joined: Thu Jul 29, 2021 10:21 am
Location: Courtenay,British Columbia,Canada
Motorcycle: 1984 GL1200 Aspencade ( Aug. 2021 )
1999 Honda Magna 750
1977 BMW R75/7

Re: fuel issues

Post by Tomcomox »

Done as noted in last paragraph. Thanks for the quick response.

Tom
joecoolsuncle
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Re: fuel issues

Post by joecoolsuncle »

Tomcomox wrote: Tue Jan 11, 2022 6:41 pm Done as noted in last paragraph. Thanks for the quick response.

Tom
sorry i missed that. im guessing here, but with the fuek pump connected, it must be flooding with fuel? test fuel pressure and float height.
Tomcomox
Posts: 8
Joined: Thu Jul 29, 2021 10:21 am
Location: Courtenay,British Columbia,Canada
Motorcycle: 1984 GL1200 Aspencade ( Aug. 2021 )
1999 Honda Magna 750
1977 BMW R75/7

Re: fuel issues

Post by Tomcomox »

Will do.... but it starts and runs when a jerry can/fuel is attached ...?

Tom
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WingAdmin
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Re: fuel issues

Post by WingAdmin »

There's a specific test in the service manual to determine if your fuel pump is flowing sufficient fuel:

GL1200 Fuel Pump Test
GL1200 Fuel Pump Test

Tomcomox
Posts: 8
Joined: Thu Jul 29, 2021 10:21 am
Location: Courtenay,British Columbia,Canada
Motorcycle: 1984 GL1200 Aspencade ( Aug. 2021 )
1999 Honda Magna 750
1977 BMW R75/7

Re: fuel issues

Post by Tomcomox »

Did that test on old and new pump, it was all good, I now have a spare pump.

Thanks,

Tom
joecoolsuncle
Posts: 113
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Location: oxford, ar
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Re: fuel issues

Post by joecoolsuncle »

how long after connecting gravity feed tank does it take to get engine running?
Tomcomox
Posts: 8
Joined: Thu Jul 29, 2021 10:21 am
Location: Courtenay,British Columbia,Canada
Motorcycle: 1984 GL1200 Aspencade ( Aug. 2021 )
1999 Honda Magna 750
1977 BMW R75/7

Re: fuel issues

Post by Tomcomox »

Instantly. after carbs were put back on, turned over wouldn't start, went the jerry can route started right away. ( happy dance ). Ran it for 30 mins, smoke cleared. was running a little off but I expected that, played with carbs a little settled down. Put everything back together , pump,relay, went to start to sync. carbs next day, same thing, bypassed fuel system again and was able to synchronize the carbs, idles 950 - 1000 rpms.

I'm trying to figure out if there is some collation between , fuel shut off relay (new), coil/CDI, fuel pump (new) wiring that i'm missing or if it has some sort of bad wiring somewhere. When she runs she purrs like a kitten, just a little perplexed with this problem.....

Thanx....

Tom
joecoolsuncle
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Re: fuel issues

Post by joecoolsuncle »

but you said fuel comes out fuel hose when connected to pump. i mentioned pressure test from pump.............. im lost.
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Rambozo
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Re: fuel issues

Post by Rambozo »

Even with no fuel pump it should run for a bit on what is in the carbs. So, I would also be inclined the think the fuel pressure could be too high and it is flooding.
Tomcomox
Posts: 8
Joined: Thu Jul 29, 2021 10:21 am
Location: Courtenay,British Columbia,Canada
Motorcycle: 1984 GL1200 Aspencade ( Aug. 2021 )
1999 Honda Magna 750
1977 BMW R75/7

Re: fuel issues

Post by Tomcomox »

I will be doing a pump pressure test tmr. Will post results / info .

I did the GL1200 Fuel Pump Pressure test ,5 sec / beaker as per WingAdmin info. That was good.

I'm also working on a 40 ft motorsailer so if I don't get to any of these responses quickly please don't take it personally, I'm just busy elsewhere.

Between bike, boat, an ongoing divorce and with ALL the snow and rain we've been getting I'm just trying to keep my head above water...with a smile.

Thanks to all for your inputs, keep em coming, there's a light at the end somewhere.

Cheers,
Tom
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Rednaxs60
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Re: fuel issues

Post by Rednaxs60 »

Not much on carb issues, but isn't the fuel pump required when the fuel gets low in the tank. As long as the fuel tank is full there is enough head pressure to operate the engine.

When you tested the fuel pump - on or off the engine? Power source from the bike or other? Fuel will flow through the fuel pump when the engine is not operating, but there may be no power to the pump with the key "ON".

As Rambozo mentions, there should be enough fuel in the carbs to start the engine without the fuel pump coming on. Try filling the fuel tank, bypass the fuel pump and the engine should start. This will isolate the problem to the fuel pump and/or the electrical to the pump.

Is there a blockage in the fuel tank itself? Could be some crap in the bottom that when the fuel pump comes on, it is drawn into the fuel piping and blocks fuel from coming out.

has to be in the fuel delivery system.

Good luck.
"When you write the story of your life, don't let anyone else hold the pen"

Ernest
Tomcomox
Posts: 8
Joined: Thu Jul 29, 2021 10:21 am
Location: Courtenay,British Columbia,Canada
Motorcycle: 1984 GL1200 Aspencade ( Aug. 2021 )
1999 Honda Magna 750
1977 BMW R75/7

Re: fuel issues

Post by Tomcomox »

Good day all,

Sorry for the delay, boat issues,that took 3 days.....

Just want to make a slight correction on my 12 Jan 22 post. I mentioned the CDI, thats wrong I meant to say ICU, which i believe is part of the fuel relay,coils, fuel pump system. I think my problem lies somewhere within here, I just don't know enough of the system to diagnose it. Working on it.

Have my exhaust system off at the moment so i wont be starting the bike until parts come in, but i did a pressure test on fuel pump and had 4 psi just by cranking. Not sure if bike needs to be running to get a proper reading.

Will update ASAP.

Cheers ,Tom
Tomcomox
Posts: 8
Joined: Thu Jul 29, 2021 10:21 am
Location: Courtenay,British Columbia,Canada
Motorcycle: 1984 GL1200 Aspencade ( Aug. 2021 )
1999 Honda Magna 750
1977 BMW R75/7

Re: fuel issues

Post by Tomcomox »

Hello all,

Could someone shed some light for my 1984 GL1200 A . What is the difference and jobs of the Igniter CDI unit ignition and the ICU ignition control unit. Or are these one of the same thing ...? Would these both have any connection to my fuel pump issues ?

Cheers,

Tom


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