2nd Gen Fuel Pump Problem?

I was working on my bike and decided while I was in there I should replace the Fuel Filter with a new one from Honda I had sitting around.

I swapped them out and started the bike and noticed it was running a bit funny. I looked at the fuel filter and noticed it wasn't filling with fuel. (I always notice the fuel filter is usually atleats half full when sitting).

I pulled out the fuel filter to make sure it was in properly and noticed a steady stream of fuel came out of the tank hose when I did. I reconnected everything and tried again but the fuel filter wouldn't fill up.

I put my hand on the fuel pump and felt nothing...while looking around the bike I suddenly felt a vibration under my hand and from the fuel pump but it went away.

I left my hand on the fuel pump and I could feel it start vibrating for a second or 2 then stop....then vibrate for a minute or more, than stop. All completely random and no wiggling of wires would help. (all connections to the fuel pump are fine too)

It will not fill up the fuel filter and it seems to run at random.

How should this thing work?

AM I due for a new pump?

 

There are always some bubbles visible in the top of the filter, but you cannot properly judge fuel flow from that.

If you need to test things, jump the pump relay as illustrated on paqe 4-20 of The Bible.

Pump vibrations are not random but keep about 3psi in carb fuel line at all times, and if you feel no acitvity then carbs are filled with gas.

 

3 things:

1. I'm not judging fuel flow by the bubbles in the filter...I'm judging it by the fact that there is NO fuel in the fuel filter. The only time I see fuel in the filter is when I let the bike sit with the Petcock turned ON.

2. I don't understand which wires I need to jump. I read that page but I don't get which wires I need to jump.

3. When the bike is running, should the pump be working? I thought I heard somewhere that the pump clicks once for every full turn of the crank (or something)

 

So the pump will stop working when the carbs are full?

So it doesn't pump constantly when the bike is running?

 

Pump only powers up when fuel line pressure stablizes at below about 3 psi.

If bike isn't running and eating up fuel, no action from pump until some fuel is used up.

No, does not pump constantly !!

 

That's what I needed to know.

Thanks SM.

 

Always eager to help our fine Northern brothers as long as you don't blast your music across the border like bad neighbors.

 

The relay is triggered from the yellow green wire from the pulse circuit , will only run continuously when the bike is run and will fire one time with every key cycle. To jump it you need to jump the blue black wire to battery and it will shut off when system pressure is reached as Squirrel said.

 

So to do this I need to unplug the Blue/Black wired connector (that exits the fuel pump) and connect the two prongs in the connector to the Positive Terminal of the battery?

 

No, Matt. I'd advize going to the plug connector on the pump relay and using a u-shaped bit of paperclip wire forced in to connect black and blue/black wires, followed by a dab of electrical tape.

Connection to battery not a good plan.

 

No, jump the blue black wires together from the fuel pump power connector, the pump will pump until it sees 3psi pressure if it is working properly. I suggest you unhook the carb feed hose from the pump and run the volume test as in the Honda Bible to make sure your pump is OK.