What is the best way to hook up an electric fuel pump?

I am getting ready to hook up an electric fuel pump. How should I hook up the relay? I am thinking that I should hook up the coil side of the relay to the ignition switch and run the power to the fuel pump straight from the battery. Right or wrong??

If anyone has a better way please let me know. Thanks Keith

 

rubber mount it as close to the tank as possible and wire it thru the ignition switch.

 

do it the right way with a 30 amp relayor bigger. use the ignition switch as the trigger for the relay and power from battery. after the relay use the recomended fuse in line to the pump.

 

Running the relay power thru an oil pressure switch is a nice option.

 

Even better that an oil pressure switch is to get a Ford truck inertia switch... the engine can continue running for awhile even if you are upside down, running motor= oil pressure = fuel flow. Not my idea, a mag just had an article about it with part numbers and all... I'll see if I can dig it up.

 

and use big wires. People often use wires smaller than they should. Wires that are two small is the #1 cause of burned out fuel pumps.

 

one oil pressure switch you could use is the Standard Ignition PS-64, which has 3 terminals, one for the pump (marked P), one for power from the ignition switch (marked I) and one for power from the starter solenoid feed (marked S). Properly wired up, this switch provides power to the pump while you are cranking the engine over, and then provides power from the ignition circuit when the engine is running (once it gets oil pressure). If the engine quits running, the pump shuts off.

For best results, connect the P terminal to the coil side of a relay to ensure long life of the switch...not necessary, but a good idea.

 

My thanks to you gentelmen.

 

I keep mine on a dedicated (hidden) switch. Part of my theft deterrent system. That way i know if someone takes my ride it will be no more than a mile away.
(battery-switch-fuse-pump)
Just a thought.

 

Do all fuel pumps require a relay? It didn't seem like a typical (ie. not high output) pump would draw that much power, so I wasn't gonna put a relay on that. It sounds like I should reconsider??

 

You should use a relay when you want to control a high amperage with a low amperage switch. Most switches (that are cheap) can't handle a lot of amps for a lot of years.

If you wire the fuel pump direct to a fuse block, you don't need a relay. If you add-in safety features like pressure switches, then use a small current through the switches with a relay.

 

Squirrel, You have to one of the smartest people that post. I always look forward to any post you reply to. I am not being a smart *** I really mean it. Thanks and keep posting ALOT.