---How to wire a electrical fuelpump---

[beetlemic]

I have recently installed aelectric fuelpump and now i have to wire it in a proper way.

I want to have a safety system that stops the fuelpump  if something goes wrong,thinking of wiring to a relay.

I was thinking of wiring through the oil light switch..

Do someone have a idea of how to make this work?

[Diederick/DVK]

good point, incorporating a switch and a relay is what i'd like to do.

[Bernard Newbury]

I have recently installed aelectric fuelpump and now i have to wire it in a proper way.

I want to have a safety system that stops the fuelpump  if something goes wrong,thinking of wiring to a relay.

I was thinking of wiring through the oil light switch..

Do someone have a idea of how to make this work?

The problem with wiring with a relay to the oil light is that if the low oil  light comes on it's usually too late as the damage is done. Best to wire using a relay through a pressure switch on the fuel line set at a  level lower than the pressure you normally run with an over ride to start the engine. Another way would be to put another adustable oil pressure switch set to cut in when pressure drops below 20psi and wire that to a relay. Bernie

[Jim Ratto]

not sure if what you're trying to do is a real good idea. By that I mean wiring the fuel pump to be switched by the oil pressure switch,
Some have done this in the past simply for the safety of not saturating a wrecked car with gallons of gasonline, in the event of a wreck. I guess if the engine stalls, then that's going to work.

But sounds like you are doing this to save the motor in case of oil pressure loss?

First of all, take a look at the carburetor(s).

That float bowl (s), unsupplied by a pump, is going to allow you to drive at least 1/2 a mile under light throttle conditions. Probably more. If you lose oil pressure and the switch kicks off the pump, you're motor is not going to stop in time to save it. Yeah the pump will stop, and you'll keep rolling... and kick a rod through the case with your float bowls still 50% full.

If you were running injection, it might save the motor. Or lean it out and put a hole in a piston AND the case.

Put a real big light with a 5W bulb on the dash and a horn and wire those to your oil pressure switch

I run my pump off a toggle switch that is separate from my ignition lock. My ignition lock will lock the steering if I twist it to off. If I need to get that pump turned off while rolling, I want to be able to steer.

Hope this helps
Jim

[beetlemic]

The reason why i wanted it through the oil light was in case of accident,don't want the pump to work if engine stops and ignition still is on.

The issue to solve is going to the oil light are the problems that might accure like Bernhard sayed:


"The problem with wiring with a relay to the oil light is that if the low oil  light comes on it's usually too late as the damage is done. Best to wire using a relay through a pressure switch on the fuel line set at a  level lower than the pressure you normally run with an over ride to start the engine. Another way would be to put another adustable oil pressure switch set to cut in when pressure drops below 20psi and wire that to a relay. Bernie"

[The Ideaman]

Use a Ford fuel injection inertia reset.  Rangers, F150's, mustangs, escorts and lots of others use them.  In an accident it turns off the pump until you push a button and reset it.

[JS]

That´s a thought... The old F**d Sierra Cosworths used the same here in Europe.

[bugkeeper]

Any older Golf fuel pump relay will do. It picks up the signal from your ignition (dwell angle) and if the dizzy turns the pump comes on. In case of an accident the engine stalls and the dizzy stops so does the fuel pump. Wiring is no big deal.

[beetlemic]

Use a Ford fuel injection inertia reset.  Rangers, F150's, mustangs, escorts and lots of others use them.  In an accident it turns off the pump until you push a button and reset it.

Found something that seems to be likely what you described at the junkyard 



How do i connect it??

[Jim Ratto]

I wonder how sensitive that inertia switch would be to drag race type launches? Sure would be a shame to have it disable the pump after like a 1.65 sec 60' launch.

[beetlemic]

I wonder how sensitive that inertia switch would be to drag race type launches? Sure would be a shame to have it disable the pump after like a 1.65 sec 60' launch.

Well that's why i ask before i mount it

I guess i try anyway,i doesnt take long to se how it works and the machine is not ready until may but then i can tell if it fail during take offs

[The Ideaman]

http://www.therangerstation.com/tech_library/InertiaSwitch.html
How it works.

[bugkeeper]

Check out Pierburg PN# 4.05288.50.0 which is a universal Pierburg fuel cut off relay kit. It works fine with most fuel pumps. I use that relay to shut of my Holley pump in my bug. The following link shows how it gets installed. http://www.wilmink.nl/pierburg/Pierburg_beveiliging_brandstofpomp.pdf It is easy and straight forward. I added an over right switch in order to prime the system after the bug sat for a while.
Cheers Dom 

[beetlemic]

This is what i found at our local junk yard.











This one is realize a ball when forced, that disconnects power and you have to press buttom to maintain power supply.