On to fuel pump number 3


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754
Posts: 66
Joined: Fri Sep 08, 2017 9:08 am
Location: Clermont Ga
Motorcycle: 1992 GL1500 Interstate

1978 CB750 Supersport

On to fuel pump number 3

Post by 754 » Sun May 06, 2018 9:37 am



On my home from work yesterday after fueling up, my wing began to act up. While under throttle I noticed stumbling that continued to get worse as I found a place to stop. As I stopped it quit on me and once restarted, would die when I touched the throttle. Very similar to when the original fuel pump was dying. It finally restarted and ran as it should, so I headed for home and only made it several miles before it happened again. This time I could not get it to restart. Got out the tool kit and began to dissemble it on the side of the road. Got the fuel filter out as I thought it may be stopped up, but that was not the case worked for several more minutes and found nothing. Put it all back together and it ran again, and again took for home. Made it home with no other problem. Once home it will not run, spins over just fine, just won't run. I see no fuel in the filter anymore. Guess I will be replacing the fuel pump again, I replaced it last December with a Carter pump as many have done before. Just surprised it failed so quickly.


1992 Goldwing Gl1500 Interstate

1978 CB750 Supersport

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AZgl1800
Posts: 1118
Joined: Thu Oct 30, 2008 2:46 pm
Location: Lake Oologah Indian Territory USA
Motorcycle: '02 GL1800

Re: On to fuel pump number 3

Post by AZgl1800 » Sun May 06, 2018 1:04 pm

I feel your pain, been there on my '98SE.

in my case, if I kept the RPMs below about 1500 it would keep moving forwards and I made it home.

Installed a new Carter pump from NAPA and it lasted about one trip.....
replaced that one, and installed a brass 90 degree fitting so the fuel line would not get crimped. and that resolved the problem.

it was the outlet line crimping closed, going to the top of the tank that burned up the 1st Carter pump.
~John

User avatar
754
Posts: 66
Joined: Fri Sep 08, 2017 9:08 am
Location: Clermont Ga
Motorcycle: 1992 GL1500 Interstate

1978 CB750 Supersport

Re: On to fuel pump number 3

Post by 754 » Sun May 06, 2018 1:14 pm

Good tip on putting in that 90 degree fitting. I hadn't even thought of that, good chance that may have happened to my machine. I'll get one tomorrow when I get the new pump. Thanks for the tip. Even if I kept the RPMs low it just would not run. Just happy it got me home without a wrecker bill. I'll drain the fuel tomorrow and swap the pump, only takes a few minutes.

Travis
1992 Goldwing Gl1500 Interstate

1978 CB750 Supersport

User avatar
754
Posts: 66
Joined: Fri Sep 08, 2017 9:08 am
Location: Clermont Ga
Motorcycle: 1992 GL1500 Interstate

1978 CB750 Supersport

Re: On to fuel pump number 3

Post by 754 » Sat May 12, 2018 11:05 am

Well I installed the new fuel pump yesterday and encountered similar symptoms like I had the other day. It restarted after the pump installation ran roughly, and eventually quit. It was tough to get it restarted and would barely idle. If I so much as touched the throttle it died. Wondering if the filter is stopped up. The tank is very clean, I double checked it yesterday with the pump out I could see the entire bottom. Have some new filters coming going to try to pick up some extra hose and a few unions and route around the filter and see if it runs any better. Any other things I may be missing?

Thanks,

Travis
1992 Goldwing Gl1500 Interstate

1978 CB750 Supersport

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terryt
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Location: United Kingdom
Motorcycle: 1979 gl1000 trike
1989 gl1500 trike

Re: On to fuel pump number 3

Post by terryt » Sat May 12, 2018 12:30 pm

Check the fuel tap and vacuum to it. have you checked all the fuel lines even the one in the tank. they could be collapsing.
It may be an idea to bypass the fuel tap to see if that cures the problem

DaveO430
Posts: 870
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Location: Amity. Ar
Motorcycle: 2010 GL1800
2004 Suzuki DR200

Re: On to fuel pump number 3

Post by DaveO430 » Sat May 12, 2018 1:28 pm

Have you checked if it is getting power to the pump?

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754
Posts: 66
Joined: Fri Sep 08, 2017 9:08 am
Location: Clermont Ga
Motorcycle: 1992 GL1500 Interstate

1978 CB750 Supersport

Re: On to fuel pump number 3

Post by 754 » Wed May 30, 2018 10:59 am

Finally got around to spending some time with the wing this weekend. After installing the new fuel pump and new hose about a week ago, it fired right back up and ran, but then quit while idling and would not restart. After testing the new pump multiple different ways ending with a simple bench test I found the new pump was a dead as the dodo. Went back and bench tested the old pump and it worked just fine. So I put the old pump back in and the bike started right up. Then I put in one of the new fuel filters I just got and it leaked badly from a pin hole in the plastic housing, good thing I had another one on hand put that one in and it leaked worse than the other one. That one poured fuel from the steel crimp ring on the top. Stopped at Auto Zone and got a universal 3/8 fuel filter, it's almost identical to a factory one, it's just slightly smaller in diameter. No leaks from it now it runs well, seems to have better throttle response than before. Now tomorrow I'm going to try out my homemade vacuum smoke tester. Gonna smoke the vacuum systems on the bike and try to find that little leak that keeps my bike from being perfect.


1992 Goldwing Gl1500 Interstate

1978 CB750 Supersport

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