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02-29-2020, 03:56 PM | #1 | |
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Fuel pump collision switch
Quote:
Do you think I should have a collision switch too? I guess it wouldn't hurt; belt and suspenders. But as I think about the risk being protected against, it would have to be a collision hard enough to rupture a fuel line, I'm unconscious so can't turn off the key, but still the engine keeps running a while on the gas in the carb. Whats the odds of all that? Maybe if I got rear-ended hard. Are there other scenarios, other risks I'm not thinking of? Are there other benefits to a collision switch? |
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02-29-2020, 05:48 PM | #2 |
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Re: Fuel pump collision switch
I weighed the possibilities of being in an accident where having a low oil pressure pump safety switch would be a benefit, against the possibility of that sensor or associated wiring leaving me beside the road wondering why the engine died. At my age, reliability won out over safety.
I have the oil pressure switch, which I will never install; PM me and I will send it to you. |
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02-29-2020, 06:50 PM | #3 |
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Re: Fuel pump collision switch
Thanks, that is generous of you. I appreciate that. But I already bought the switch and fittings, plan to install tomorrow. We're supposed to get one day of warm weather tomorrow, so I plan to spend it in my unheated garage. Can't wait for spring!
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02-29-2020, 07:24 PM | #4 |
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Re: Fuel pump collision switch
There are a lot of scenarios - that don't involve a ruptured tank or line. Just think about if you happen to tip the car over on it's side - you're in a ditch. Gas starts to pour out of the carb, gets on the exhaust, fire starts. Meanwhile your fuel pump (depending on level in tank, where the pickup is, etc) - keeps pumping fuel at a furious rate to the carb. And - as the car is on it's side, the float assembly in the carb is probably not stopping the fuel from pouring in . . . and right out the top . . . making a HUGE fire. All the while, you're hanging from your seat belts!
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02-29-2020, 07:35 PM | #5 |
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Re: Fuel pump collision switch
We may be talking two different things here (and I use both by the way). An engine oil pressure switch shuts the fuel pump off if the oil pressure falls below a set amount. The impact switch is a mechanical type of setup that cuts off the fuel pump in an impact or roll over. I use the impact switch out of the Fox body mustangs, but any semi-modern car will have one. They have a reset button if they a tripped, so no concern there. And you could just disconnect the wires and twist them together if need be, but there is really no way that would be required. Every car out there has a collection switch and I have never heard of a malfunction with one. They are a very simple mechanical device and just about foolproof.
An electric fuel pump will continue to run until the power is cut off to it! Depending on being able to turn a switch off is not a good solution to me. They are actually called a Fuel Shutoff Inertia Switch. Last edited by JSeery; 02-29-2020 at 07:48 PM. |
02-29-2020, 07:44 PM | #6 |
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Re: Fuel pump collision switch
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02-29-2020, 07:51 PM | #7 |
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Re: Fuel pump collision switch
Need to think about all the things that can happen in a car without air bags, shoulder belts and all the other safety devices we are accustom to! You can be the best and safest driver in the world and be hit by someone else. You can have a medical incident, etc.
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02-29-2020, 08:08 PM | #8 |
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Re: Fuel pump collision switch
My solution is to not have an electric fuel pump. I don't have fuel injection. I have NO trouble running 2 97s on 1 car, 2 81s on another, 390 4bbl on my recently finished 40 coupe, certainly no problems with a concourse 40 with a 91-99 carb, with properly rebuilt mechanical pumps. I am not racing anyone with my flatheads.
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02-29-2020, 10:50 PM | #9 | |
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Re: Fuel pump collision switch
Quote:
Goody for you no electric fuel pump however You missed the point of this post! The inertia switch is the easy solution they can be found in most wrecking yards in the trunk of older Fords that use throttle body injection systems. Usually located on the drivers side in the rear quarter area. Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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03-01-2020, 12:50 AM | #10 |
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Re: Fuel pump collision switch
I'm convinced. I'm going to add an inertia switch. Certainly easy and cheap enough to do. Thanks for your advice.
Last edited by JayChicago; 03-01-2020 at 01:33 AM. |
03-01-2020, 08:15 AM | #11 |
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Re: Fuel pump collision switch
good choice Jay. The last thing I would want is my electric pump uncontrolled in a crash or rollover.
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03-01-2020, 09:20 AM | #12 |
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Re: Fuel pump collision switch
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03-01-2020, 09:26 AM | #13 |
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Re: Fuel pump collision switch
Any FI Ford crown vic type car, on the package tray support left side, pickups usually right lower kick panel. Sometimes if you ask for Mustang parts the price goes up.
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03-01-2020, 12:30 PM | #14 |
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Re: Fuel pump collision switch
I use a cut off switch mounted near the ignition switch
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03-01-2020, 05:58 PM | #15 | |
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Re: Fuel pump collision switch
Quote:
Very good idea. One suggestion put the switch in a location you can easily get to so you can reset the push button when needed. You may find if you hit a bad bump or if placed in the truck and you happen to drop the lid this might cause enough surface shock to cause the switch to open. This would happen at times of Fords when the trunk lid slammed closed the shock created would cause the switch to open results car would not run. Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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03-01-2020, 07:46 PM | #16 |
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Re: Fuel pump collision switch
new to the idea of a pressure switch. how does it power the circuit? how do you start the car with no pressure? asking cause i;m putting an electric pump on mine.
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03-01-2020, 07:50 PM | #17 |
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Re: Fuel pump collision switch
If your carburetor is good. You will have fuel in the bowl to start the car in most situations.
A inertia switch is not a pressure switch. It's made to shut off fuel if there is an impact/crash (think like a mercury switch). In the unfortunate or unlikely event you have a crash it will stop the fuel from being pumped. I use a mechanical pump, when the engine is off the fuel pump stops. https://www.fordbarn.com/forum/showt...inertia+switch There are better threads on installing them. Didn't find them on the first search. . Last edited by Tinker; 03-01-2020 at 08:01 PM. |
03-01-2020, 07:59 PM | #18 |
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Re: Fuel pump collision switch
neither link would do anything for me. Yeah i know the diff between inertia and pressure, i want to know how to install the pressure, and yet start the car with no pressure.
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03-01-2020, 08:04 PM | #19 |
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Re: Fuel pump collision switch
Please explain the fuel pressure switch you are referring to? If you are talking about the oil pressure switch. You think you need that? I guess if you had a bonneville or drag car it makes sense.
Same thing, fuel in the carb. Oil pressure will be up from cranking to start if you have oil pressure. Last edited by Tinker; 03-01-2020 at 08:35 PM. |
03-01-2020, 10:35 PM | #20 | |
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Re: Fuel pump collision switch
Quote:
How you prime/start the engine before oil pressure is up: A second supply wire is run to the switch from the starter solenoid. (aftermarket solenoids have a terminal for this purpose) That second supply wire is connected to the switch's pole feeding the fuel pump, bypassing the switch. While the solenoid is activated, power is supplied to the pump. Requires cranking the starter. For priming, you could do same by running a second supply wire from a dash board switch. That was my plan for an automatic kill-switch before reading the advice from others. Now I feel the inertia switch is a better way to go. Could do both, but don't think that's necessary. The pressure switch has one advantage: will starve the engine if oil pressure is lost suddenly. |
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