Testing fuel pump on 85 Aspy

[Wing nut]

Week ago the bike quite on me while riding to work, acted just like it ran out of fuel but without any sputtering or warning. Gauage said 1/4 tank, called wife for gas can, filled it up, no dice. Sounded like it wanted to start with full choke and starter engaged. Trailered it home, pulled fuel line from tank to fuel pump. Gas runs freely from petcock, no filter or line blockage (will replace filter while out). Can anyone share the safe and easy way to test the fuel pump? Any ideas what else the problem may be?

Thanks,
Desmond

[SIR tricky]

If the fuel pump is OK as per the test, then I suggest the fuel pump relay could be faulty.

[Wing nut]

Thanks Tricky, I appreciate it, will find an evening this week and see what I get.

[Wing nut]

Ok, next basic question... Where the heck is the fuel pump relay connection that is supposed to be unplugged and shorted across? Do I need to remove the false tank? Can I unplug the pump at the pump and power straight from the battery to test it? I got big hands with stiff joints, looks like I need to befriend a midget mechanic! Sometimes ya spend more time looking for something than it actually takes to fix it!

Thanks,
Desmond

[neoracer]

yes faux tank will need to come off,relay is located between the steering head and the right pocket,its a black expoxy capsule which will have CF-304 printed on it alond with another two numbers,tricky and i found that the other two numbers are not important[attachment=0]

copy sent to your email

[Wing nut]

Thanks Neoracer, the info including the attachment are great! What manual was that from? Sure isn't from my Honda "shop manual" that has pictures from a bad xerox machine! Weekend project, here I come!

[neoracer]

85 Honda Electrical Manual

[robdavspa]

I believe you can unplug the pump at the fuel overflow pan. My '84 has a plug there that goes to the pump. Running it to check it will not damage it. No need to take the faux tank off to do that. Accessing the relay will require removal of the tank. Bob

[SIR tricky]

there is a connector by the gas filler tray. one wire should test good to ground and the other is the voltage from the relay. If you apply voltage to the wire other than the ground wire the pump should pump of course the ground wire from the pump has to be jumped to ground

[neoracer]

may sound silly but the first thing that should be checked is fuse#4 FUEL PUMP,Starter,charging system♦[attachment=0]

but if fuse #4 is blown,starter will probably not be working also,and if that doesn't work power wont to supplied to the coils which eventually ends up powering the fuel pump relay

[Wing nut]

My fuel pump tests out bad and I noticed that in another post someone installed an Autozone Mr.Gasket # 12S for about $44.99. Looks like it pumps at 4-7 lbs, and draws about 2 amps. To install they said to connect the green wire to the black wire on the pump, the other wire, blue/green, to the red wire.

My question is - was the connection made to the switched accessory connections in the main fusebox or to the old fuel pump connection under the fuel filler tray? That thread was several years old so I didn't see any point in asling there.

I'm not sure if the pump was the original problem or if I ham handedly shorted it while testing! I would prefer to wire it to the accessory connections and skip the whole fuel pump relay thing which I don't know if would work with this pump anyway. Anyone done this or see a problem doing so?

[SIR tricky]

The point of the pump being wired to the existing relay is that if the engine is stopped the pump will not be pumping gas into the carbs. If you connect it to the ACC it will mean that the pump will start pumping immediately the key is turned on.

It is a safety issue AFAIK.

To err on the side of safety I would connect it to the existing relay.


The black wire on the MR Gasket pump is ground so yes the green wire going to the existing pump is ground and would be connected together, the red wire on the mr gasket pump is the hot wire.

Remember the mr gasket pump should be mounted at 45deg with the lower hose connected to the fuel filter.

Another possibility is a pump from a Honda Prelude. I read that that has been used.

[Wing nut]

Thanks Tricky, is it a safe assumption that since a test light hooked to the hot side of the connector under the fuel filler tray comes on when the starter button is pressed (but not when the switch is turned on), then the fuel pump relay is good?

[SIR tricky]

Thanks Tricky, is it a safe assumption that since a test light hooked to the hot side of the connector under the fuel filler tray comes on when the starter button is pressed (but not when the switch is turned on), then the fuel pump relay is good?

UH UH don't get fooled by that, my relay tested good with a test light but didn't supply enough power to activate the pump. Fortunately I had already discredited the relay by using the jumper method to ensure the pump was good prior to using a test light.

If the pump runs, the relay IS OK, if the pump doesn't supply the required amount of fuel per the test then the pump is at fault.

[Wing nut]

Tricky - what do you mean by "mount the pump at 45 degrees"?