Does anyone have a schematic or good written explanation of how a VW fuel pump relay works? I understand that it comes on with ignition power, times out, then comes back on when it somehow senses the engine is running (ignition pulses?) I am toying with the idea of retrofitting an electric fuel pump to an older carbureted car and I like the idea of using ignition to sense that the car is running rather than have it run all the time when the ignition switch is on.
couple questions:
- is the FPR a self contained unit, i.e. a complete control for the fuel pump requiring only that the correct wires be hooked up in the correct places?
- how much amperage is it safe to draw through the FPR? i.e. at what point should I consider adding another relay to keep the FPR from burning out? I know they are problematic even in stock VW apps.
- not having a VW handy to look at anymore, is the socket a standard Bosch relay socket, or would I have to cut up a VW fuse box?
thanks!
nate