Fuel Pump? - Honda Shadow Forums : Shadow Motorcycle Forum

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Old 10-29-2012, 12:01 PM   #1 (permalink)
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Default Fuel Pump?

1985 Honda Shadow VT700C,
Alright so I swindled this bike from a gent for 350 bucks that let it sit in a parking lot for 6 months. I got it running after some carb work....here lies the problem. One the battery is pretty weak but as long as it stays on the trickle charger seems to start and run the bike fine.

Major Problem: So some times when i turn the key on I hear the fuel pump turn on and off (sounds evenly timed out, {not sporadic}) When i hear the fuel pump kick on the bike will start. The bike will run and drive, and then all of a sudden the fuel pump will just stop working and the bike will die out. Wait 15-20 mins the fuel pump will come back on but you never know for how long. This bike has had electrical issues. Is this a dying fuel pump, or a bad battery, or something shorting out.

I have heard that if you have a bad battery that will not hold a 13v+ while running it will not power some essential components. Would love to hear some advice or experince! if you need pictures or further explanation, would be happy to.
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Old 11-05-2012, 05:14 PM   #2 (permalink)
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I had a similar problem with my 84 VT700. Mine was the fuel pump relay was going out. When it finally went I just wired my fuel pump directly to the battery using a toggle switch. I turn the switch on to ride and off when I park it. The fuel pump is designed to only run when the carbs need fuel (based on pressure in the fuel line). I have been running like this for about 6 months now with no problems.
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Old 11-05-2012, 07:09 PM   #3 (permalink)
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Search for fuel relay jumper. With the jumper in place the fuel pump will come on with the ignition key, no need for a switch.
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Old 11-05-2012, 07:52 PM   #4 (permalink)
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Quote:
Originally Posted by verdeva View Post
Search for fuel relay jumper. With the jumper in place the fuel pump will come on with the ignition key, no need for a switch.
^ That's what I did. My fuel pump is wired to my ignition switch.
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Old 11-05-2012, 09:55 PM   #5 (permalink)
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I rewired the fuel pump to a switch...no problems now !
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Old 12-11-2012, 12:07 AM   #6 (permalink)
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Anyone know if the stock fuel pump is rebuildable? Mine is leaking.

Ray.
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Old 12-11-2012, 08:41 AM   #7 (permalink)
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I dont believe so, I have heard of people using universal fuel pumps, and adjusting it to 2-3 psi of fuel...i believe thats what the carb demands....further research would be required though.

I dont know if these will work.
Fuel Pumps (Universal) - BikeBandit.com
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Old 12-11-2012, 11:45 AM   #8 (permalink)
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I took mine apart when i was messing with my reserve tank rust problem just to see how it worked and I dont think you can "rebuild" them, but you can "clean" them.. not sure its worth it tho.. but if your there its easy to take apart and do an autopsy on... kinda cool to see how it works...
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Old 12-11-2012, 01:20 PM   #9 (permalink)
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Maybe it it's a seal leak you can seal it with something or get a new seal.
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Old 12-11-2012, 11:37 PM   #10 (permalink)
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Maybe it it's a seal leak you can seal it with something or get a new seal.
Yeah that's why I was asking. I'm hoping it's just a small gasket or something I can make.

Thanks superdiver for the info. I just didn't want to take it apart and eff something up eh.

Ray.
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