whats the best way to wire a fuel pump?

[droptop]

Im trying to hook a E2000 electric fuel pump to a boost sensitive regulater with a return line.

How should I wire the pump?
should I just wire the pump to the key switch or will this flood the carbs if the engine isnt started right away?

Or do I need a relay or oil pressure switch? if so were do I find these?

[seabeebuggy]

Mine is wired to the coil power supply. No issues. I have had it fill a cylinder up before. There was a small rubber chunk in the needle seat. I do not let is sit on for too long just in case .

[Marc]

For safety's sake you should wire it so that it will stop if the engine does. Not just to preclude filling up the crankcase with gas, either - imagine you get in an accident and are knocked unconscious...even scarier, a carb was broken off - if the pump is simply wired to the ignition circuit, fuel will be dispensed freely until someone comes along to switch off the key.
There are basically four approaches to safely wiring an electric fuel pump:
Use an interrupter switch that'll cut power in the event of an impact (easily scrounged from a Ford in the boneyard). This won't prevent flooding out the engine if a float valve leaks, but it could save you.
Use a control relay like those in water-pumper VWs which receives an input from the ignition "tach" lead and will kill the pump if the engine stops.
Use a relay controlled by the engine oil pressure switch.
  "   "    "          "         "    "   generator/alternator output.

You can add a pushbutton bypass switch if desired to allow for filling the carbs after maintenance or to allow "limp-home" if something goes wrong (for example, to get the car to a safe place off the highway in the event of a broken fanbelt with the charging-system-controlled setup).

[Buggin_74]

im just using a factory EFI fuel pump relay same as the late water pumpers use
works well, pump starts running as soon as i start cranking the starter and cuts out when the engines stopped
no probs yet
i looked at using the alternator D+ but it was only getting 4 volts at higher revs
is that enough to keep a relay pulled in?

[droptop]

I like the idea of using the tach signaled relay. What year vw's can I find this relay in?

[Buggin_74]

mine came out of an aus made 80s GM car
but from what i hear all EFI vw water pumpers had them
so golf/rabbit etc from late 70s? onwards

its like a normal relay but with few extra terminals
heres mine