[62131]

Does anyone have ideals about a shut-off circuit for an electric fuel pump due to a line that might burst or an accident?   

[sammons]

Mid 80's early 90's FoMoCo(Crown Vic,Mustg, etc)had real simple inertia switches mounted in the trunk, usually under package tray or qtr panel inner reinforcment strap.  Any jolt shuts them down.
That should cover accedent, then an additional manual cut off in line (bottom of dash?)for other troubles when you have time to react

[62131]

Found that one and one that works off oil pressure switch in case fuel line rupture

[madmike3435]

I have been running the old stewart warner 240A 12V electric fuel pump since 1970 in my coupe and I use an on off switch under the seat and also as a theft prevention device.

the automatic shut off ford device sounds like an excellent idea.

mike       

[62131]

I'm thinking of safety issues here. if your in an accident and can't turn the pump off it can spray fuel and cause a fire. or if a fuel line ruptures it can spray fuel on hot component's. Just want to be safe.

[EDNY]

Stock cars will have a centrally located and labeled fuel shut off valve in case of a wreck so the track crew can just reach in and turn off the fuel.

Like Mike mentioned you can easily mount a power switch to cut the fuel off. The Ford cars have bump switches in the trunk, they have a simple reset button.

If you want to get serious you could install a full electrical shut down switch like the one attached...shuts everything down and prevents electrical fires that could spread or ignite spilled fuel.

[sammons]

I had the inertia switch on my '66 Mustang. When I got finished painting and was putting the wheels back on, I released the floor jack too fast(hands givin me fits) and bounced down. The car wouldn't start, scratched my head a bit before i remembered to check inertia switch
 Same car a year and a half later, just heading out of town and smelled fuel. Pulled over and shut off. Short rubber line just past the frame rail fuel filter had blown a hole and was spraying on the rear of the headers. Grabbed a plastic cup out of the ditch, wedged behind line to deflect the fuel to get back to the shop.Note, still had enough pressure to run the EFI. I don't know how sensitive the fuel pressure switch would be, but I would darn sure install the toggle (manual elect on/off) switch. Some times the nose knows first!

[themoose]

I have a oil pressure cutoff switch in my 32. The pump will only run if the engine is running of if the starter is engaged. If you do try to use this setup a word of caution. When I first built the car I used a Delco switch because after working for GM for a number if years and and being with their pressure shutoff switches that were used in production on some models I felt confident with it. That didn't last long because it failed soon after getting the car on the road leaving me on the side of the road swearing and scratching my head. Luckily I had a test light with me and was able to determine that the pressure switch had failed and was able to bypass it to get home. I got a warranty replacement from my GM parts manager and it also failed within 500 miles. I didn't want to give up the safety factor of this setup so I did some research and found that GM was now outsourcing the switches overseas and they were crap. In talking with a GM engineer that I know I was told to use a pressure switch that GM was using in their Diesel industrial engines because they were designed for use is severe conditions and were overly engineered . I put one in and have not had any problems for over 6 years now. Take a look at the .PDF file attached for the tech data..

[62131]

I have a oil pressure cutoff switch in my 32. The pump will only run if the engine is running of if the starter is engaged. If you do try to use this setup a word of caution. When I first built the car I used a Delco switch because after working for GM for a number if years and and being with their pressure shutoff switches that were used in production on some models I felt confident with it. That didn't last long because it failed soon after getting the car on the road leaving me on the side of the road swearing and scratching my head. Luckily I had a test light with me and was able to determine that the pressure switch had failed and was able to bypass it to get home. I got a warranty replacement from my GM parts manager and it also failed within 500 miles. I didn't want to give up the safety factor of this setup so I did some research and found that GM was now outsourcing the switches overseas and they were crap. In talking with a GM engineer that I know I was told to use a pressure switch that GM was using in their Diesel industrial engines because they were designed for use is severe conditions and were overly engineered . I put one in and have not had any problems for over 6 years now. Take a look at the .PDF file attached for the tech data..


Moose did you use this in the fuel line or oil pressure from the engine, do you have a wiring diagram by chance , which switch did you use. I'm sure there's a relay involved I'm wanting to include the Ford inertia switch that Sammons is talking in the circuitry and that should give me  a safety cut off for both condition of a fuel link and collision. I hope I'm not over thinking this. 

[themoose]

Moose did you use this in the fuel line or oil pressure from the engine, do you have a wiring diagram by chance , which switch did you use. I'm sure there's a relay involved I'm wanting to include the Ford inertia switch that Sammons is talking in the circuitry and that should give me  a safety cut off for both condition of a fuel link and collision. I hope I'm not over thinking this. 

You use the oil pressure from the engine , that way if the engine shuts off because of an accident or a ruptured line causing the arbitrator or FI to starve for fuel thus killing the engine the fuel pump will shot off due to lack or pressure to the switch. One lead on the NC post goes to the starter which allows the pump to run while the starter is cranking. Once the engine starts the switch opens the NC contacts and closes the NO circuit allowing the pump to run with voltage supplied from the ignition circuit. I used switch number 5A because I'm using a high pressure oil pump that will never drop below 14lbs at idle and has a max pressure of 150psi which is more than enough for what the max of my oil pump will ever produce. Depending on you oil pressure you might want to go with the one of the lower pressure ones to make sure the pump doesn't shut off at idle. They all have at least a 150 lb over pressure rating so you don't have to worry about damaging the switch with a high perf pump.

[EDNY]

Attached the instructions for your EFI setup....looks like the blue wire Pin C is the wire you need to (switch) before it gets to the fuel pump.

Are you going to use the EFI to turn on cooling fans?

[themoose]

If the fuel pump circuit is wired correctly whether it be a carbureated or FI system it should go through a relay. All you need to do is wire the OP cutoff switch in line with switched side of the relay and it will work correctly and as Ed said ,according to the FI wiring in your case it will be the blue wire. Really simple to do...

[62131]

Attached the instructions for your EFI setup....looks like the blue wire Pin C is the wire you need to (switch) before it gets to the fuel pump.

Are you going to use the EFI to turn on cooling fans?

I wasn't planning on it, currently I have it on a temperature switch in the intake controlling the fan relay, also it's wired to come  on when I turn on the a/c   

[EDNY]

Attached the instructions for your EFI setup....looks like the blue wire Pin C is the wire you need to (switch) before it gets to the fuel pump.

Are you going to use the EFI to turn on cooling fans?

I wasn't planning on it, currently I have it on a temperature switch in the intake controlling the fan relay, also it's wired to come  on when I turn on the a/c

You should be fine that way..on my 94 Chevy truck with TPI I have a manual fan and don't even have an electric fan. Don't know if you have the 8 or 10 pin EFI but to have the fan come on via the ECM you would just need to remove the current intake switch wire and hook it up to the Pin C wire on the 10 pin connector - it (ECM) would then supply the ground the current relay you must already have. That's something you can consider once the car is up and running.  I assume you have a single speed electric fan.

[62131]

Attached the instructions for your EFI setup....looks like the blue wire Pin C is the wire you need to (switch) before it gets to the fuel pump.

Are you going to use the EFI to turn on cooling fans?

I wasn't planning on it, currently I have it on a temperature switch in the intake controlling the fan relay, also it's wired to come  on when I turn on the a/c

You should be fine that way..on my 94 Chevy truck with TPI I have a manual fan and don't even have an electric fan. Don't know if you have the 8 or 10 pin EFI but to have the fan come on via the ECM you would just need to remove the current intake switch wire and hook it up to the Pin C wire on the 10 pin connector - it (ECM) would then supply the ground the current relay you must already have. That's something you can consider once the car is up and running.  I assume you have a single speed electric fan.

Yes it's Spal 16" single speed fan