1985/86 Fuel Pump Relay - Honda Shadow Forums : Shadow Motorcycle Forum

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Old 05-18-2013, 08:53 AM   #1 (permalink)
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Default 1985/86 Fuel Pump Relay

Hi there, Ive search the forum for other threads but couldnt get a clear answer.

I have an 86 vt1100. It started stalling out, starving for fuel. Tried another fuel pump with same results. Then bypassed the fuel pump relay, and it seems to work.

Do I need to replace that relay or is it ok ro ride without it?


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Old 05-18-2013, 09:20 AM   #2 (permalink)
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I've ridden with out my relay for nearly three years now. The only time the relay makes a difference is when the key is on but the bike is not running. It doesn't allow power to the fuel pump unless the bike is running. It's more of a safety than anything. In theory in an accident bad enough to rupture or displace fuel lines the pump could keep running and pump fuel out, the relay is there to prevent that.
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Old 05-19-2013, 07:54 PM   #3 (permalink)
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Ok. Thanks. Just wanted to make sure I wasn't going to run into any problems riding without the relay.


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Old 06-23-2013, 09:30 AM   #4 (permalink)
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99 Honda Shadow Aero 1100 Fuel Pump Relay circuit diagram
My 99 honda showow aero 1100 fuel pump relay went bad. I tried to fix it by opening the relay but looks like the fuel pump relay is molted with cement so no way to open it. Please let me know where can I get the detail circuit diagram of the fuel pump relay so that I can build from scratch.

Anyone build the fuel pump relay from scratch yet?

Any help would be great.

Thx
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Old 06-23-2013, 10:18 AM   #5 (permalink)
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I don't think there is anything special about that relay, other than being solid-state (SSR), rather than mechanical... a relay is a relay, right? I would think you could wire in any 4-pin SSR of appropriate Amps to do the same job? I could be wrong on that, and I've been wrong in the past, lol... but it may be worth a shot... and could save you $ over a new relay from Honda if you can buy the SSR cheaply enough.

I've not looked at SSR's lately, but I know they use to be quite pricey for higher Amp panel mounts... $40+, and then you'd have to actually wire it in... so you still may save some $ over Honda's part... but will it be worth the time/effort?

Looking at the wiring diagram, it looks like the relay trigger should be the ignitor unit... which means the SSR would likely need to be a delay unit (add extra cost there).

36100-MN4-008 RELAY, FUEL CUT $56.16 (1999 VT1100C2, but should be the same part)
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Old 06-23-2013, 10:25 AM   #6 (permalink)
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Quote:
Originally Posted by Earthling789 View Post
I don't think there is anything special about that relay, other than being solid-state (SSR), rather than mechanical... a relay is a relay, right? I would think you could wire in any 4-pin SSR of appropriate Amps to do the same job? I could be wrong on that, and I've been wrong in the past, lol... but it may be worth a shot... and could save you $ over a new relay from Honda if you can buy the SSR cheaply enough.

I've not looked at SSR's lately, but I know they use to be quite pricey for higher Amp panel mounts... $40+, and then you'd have to actually wire it in... so you still may save some $ over Honda's part... but will it be worth the time/effort?

Looking at the wiring diagram, it looks like the relay trigger should be the ignitor unit... which means the SSR would likely need to be a delay unit (add extra cost there).

36100-MN4-008 RELAY, FUEL CUT $56.16 (1999 VT1100C2, but should be the same part)
Here is a link to a fairly new site, best prices I have seen yet.http://www.hondabikes.com/fiche_sele...=36100-MN4-008
$45.00
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