Fuel pump issues


Information and questions on GL1500 Goldwings (1988-2000)
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amartin71295
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Joined: Sat Mar 06, 2021 7:49 pm
Location: Winnsboro Louisiana U.S.
Motorcycle: 1990 GL1500 SE

Fuel pump issues

Post by amartin71295 »



My 1990 1500 se has a fuel pump wiring problem. The black/ blue wire shows battery voltage unplugged with key on but drops to nothing when plugged to pump with key on . Any help appreciated.


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Swagonmaster
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Location: Stokesdale, NC
Motorcycle: 1990 gl1500 SE

Re: Fuel pump issues

Post by Swagonmaster »

Sounds like you have voltage without amperage! Look for a poor connection or defective engine control unit as there is a connection as evidenced by having enough continuity to show on a meter when disconnected. Book says that fuses 2, 12 and the dogbone fuse by the battery are involved. They hide fuse 12, it's in the relay box. And then we get to the relays. Try leaving the meter on the blue/black wire with it pluged up and wiggle wire connector, fuses and relays to see if you can find the area of the problem when the voltage comes up as you move things.
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ct1500
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Re: Fuel pump issues

Post by ct1500 »

First off there should be voltage to the fuel pump only during engine cranking or running. The voltage you are seeing is likely a stray voltage that is back-feeding either through a wiring problem or other areas of the harness that are currently disconnected? The miniscule stray voltage when connected will just go harmlessly to ground through the fuel pump. Are you getting voltage to the pump with the engine cranking?
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amartin71295
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Location: Winnsboro Louisiana U.S.
Motorcycle: 1990 GL1500 SE

Re: Fuel pump issues

Post by amartin71295 »

No voltage at start I'm thinking bad ecu.
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Swagonmaster
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Re: Fuel pump issues

Post by Swagonmaster »

Before you jump on that train make sure that the ecu has power as it should, it would be nice if you can blame a 50 cent fuse rather than a mega buck ecu.
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amartin71295
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Re: Fuel pump issues

Post by amartin71295 »

All fuses are good everything except cruise control works as should
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Swagonmaster
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Re: Fuel pump issues

Post by Swagonmaster »

When I get a few minutes I will look up which pins on the ecm should be hot so you can make sure that current is even going in to be able to come out.
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Swagonmaster
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Re: Fuel pump issues

Post by Swagonmaster »

Ok, it seems that there is only one hot wire to the ecm and that is a black/white wire at pin 4 but it goes through the engine shut off switch so make sure that switch is on.
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Swagonmaster
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Re: Fuel pump issues

Post by Swagonmaster »

While you are checking things see if you are getting spark at the plugs, the ecm may not turn on the fuel if it doesn't recognise the engine turning over and that goes for the spark as well.
Try to learn from the mistakes of others..... you won't live long enough to make them all yourself!
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ct1500
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Re: Fuel pump issues

Post by ct1500 »

amartin71295 wrote: Mon Mar 08, 2021 10:04 am All fuses are good everything except cruise control works as should
???
With key ON and cruise control switch to ON the cruise light should be illuminated, this verifies the ECM circuit is powering, does it? If your pulse generators are messed up or installed incorrectly it will not run. Any work done in that area recently or around the right radiator fan? Verify that ECM wire connector is firmly seated.
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amartin71295
Posts: 7
Joined: Sat Mar 06, 2021 7:49 pm
Location: Winnsboro Louisiana U.S.
Motorcycle: 1990 GL1500 SE

Re: Fuel pump issues

Post by amartin71295 »

When I bought the bike they had the pump hooked up in the fuse panel. It runs fine been running like that for over a year. Pump went out and I replaced with a napa pump and wanted to hook back to original wires. Cruise hasn't worked since I got it but light comes on when I engage it.
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Swagonmaster
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Re: Fuel pump issues

Post by Swagonmaster »

This is sounding like it really is the ecm that is at fault and it was diagnosed and bypassed. Sometimes the ecm can be repaired but it may not be worth it if a replacement can be found at a reasonable price.
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amartin71295
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Motorcycle: 1990 GL1500 SE

Re: Fuel pump issues

Post by amartin71295 »

Is an ecm from an 89 the same as a 90
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Swagonmaster
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Re: Fuel pump issues

Post by Swagonmaster »

Ar the part numbers the same?
Try to learn from the mistakes of others..... you won't live long enough to make them all yourself!
amartin71295
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Joined: Sat Mar 06, 2021 7:49 pm
Location: Winnsboro Louisiana U.S.
Motorcycle: 1990 GL1500 SE

Re: Fuel pump issues

Post by amartin71295 »

Did some research and no they are not. I fo und a couple on ebay may get one. Tks for everything.
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MikeB
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Re: Fuel pump issues

Post by MikeB »

amartin71295 wrote: Mon Mar 08, 2021 8:25 pm Is an ecm from an 89 the same as a 90
I think they are different.
MikeB
1998 - GL1500 w/184,500 miles ~ 2017 - GL1800 w/13000 miles
USAF Avionics Communications Tech - 1968 - 1986 / Flight Engineer C-130E - C-141B - 1986 - 1992. Retired
Industrial Maintenance Tech - 1992 - 2014
Retired in Tacoma, WA
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Swagonmaster
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Re: Fuel pump issues

Post by Swagonmaster »

Once you get your replacement ecm unless you are wanting to keep the old one for some reason I'd be willing to pay the freight to get it for a post mortum.


Try to learn from the mistakes of others..... you won't live long enough to make them all yourself!
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