'87 VT1100 fuel pump question
This 1100 Shadow is the first motorcycle I've owned or worked on with a fuel pump. All the others, and there have been many, have been gravity feed only. I have a question I hope someone can answer.
How do you test a fuel pump to see if it is working correctly? This bike sat for a long time before I got it. The previous owner told me he had tested the fuel pump and it was good. But it isn't pumping any fuel.
Details: I have replaced the petcock, and the fuel lines to and from the fuel pump were replaced by the PO. I have confirmed that gas is making it through the fuel filter to the fuel pump. I pulled the line that runs to the carbs and nothing is coming out of it. I tried to prime the pump by pouring gas into that line, but it didn't help.
The fuel pump apparently has power going to it, but the wiring in the bike has been messed with. There are three wires and a ground coming out of the harness that connects to the fuel pump. Only two of those wires are connected to live wires. I'm not sure how to check the ground. The third wire, a black and yellow one, has no corresponding wire coming out of the other side of the connector. The wiring diagram in my Clymer manual shows only two wires and a ground running to the fuel pump. Both of the wires matching the colors in the wiring diagram are connected to live wires.
One thing I have considered, but haven't done because I wasn't ready yet to disassemble bike, was the possibility that the fuel lines into and out of the fuel pump have been switched. Can anyone tell me which is the fuel in connector and which one is the fuel out connector on the pump?
Before I spend a lot of money I don't really have to buy a new fuel pump I'd like to be able to find out for sure if this one is good or bad.
Any suggestions, anyone?
1987 Honda Shadow VT1100
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1975 Honda CB750K
1978 Honda CB750F3
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1969 Yamaha DT1