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03-01-2020, 10:47 PM | #21 | |
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Join Date: May 2010
Location: MN
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Re: Fuel pump collision switch
Quote:
A four pole solenoid does not delay or give early power to a source. You are kind, but it does not do that. 4th pole is made for direct full voltage to the coil momentary when the solenoid is acted apon. but maybe there is another 4 pole i'm not familiar with. Not uncommon. Guess you could wire it to the fuel pump also. Not sure how that's different or better. Still the same as the regular solenoid. A single power switch from the battery under the bash would be better to prime the fuel. But the only way to switch off the pump is to turn the switch off under the dash. No big whoop. Ever drive a model a with the tank at your knees. Not sure what the level the oil pressure switches off at. I do think you are making the best decision. It's really over thinking something. . Last edited by Tinker; 03-02-2020 at 12:10 AM. |
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03-02-2020, 01:34 PM | #22 |
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Location: upstate NY
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Re: Fuel pump collision switch
JayChicago,
Your original question has got me thinking of installing an inertia switch in my car. Good idea. Another thing to consider, If you haven't already installed one. You may want a roll over vent check valve also. |
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03-02-2020, 02:11 PM | #23 |
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Re: Fuel pump collision switch
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03-02-2020, 04:08 PM | #24 |
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Join Date: Mar 2011
Location: upstate NY
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Re: Fuel pump collision switch
Rock Valley
If you don't have an opening they sell the bungs also. I would make sure you are taking the proper precautions when welding on fuel tanks. |
03-02-2020, 05:09 PM | #25 |
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Join Date: Nov 2012
Location: Wichita KS
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Re: Fuel pump collision switch
If it is a 12v negative ground system it should be fairly easy to wire it up. On the original 6v system might have to get a bit creative. And I have no idea if the switch will work on 6v, but would guess it would. Modern vehicles normally have both a pressure switch and an inertia switch, but they also use high pressure fuel systems.
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03-02-2020, 05:55 PM | #26 | |
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Location: pittsfield, MA
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Re: Fuel pump collision switch
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Quote:
the more important thing in cars today are shoulder harnesses and air bags. How many old cars have you seen with shoulder harnesses? Maybe start a thread on air bag mods. I have an electric pump on our 46 only to turn it on/off to prime it if it has sat a week or 2. So no collision switch required. Maybe get your car to work like original with a fuel pump to get gas to the carb. Before you jump on me, the OP never said if he has 6 or 12 volts and asked for opinions so this is JMO John Last edited by oldford2; 03-02-2020 at 07:10 PM. |
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03-02-2020, 09:58 PM | #27 | |
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Re: Fuel pump collision switch
Quote:
The question raised in this post is regarding a '37 streetrod. Already has been converted to 12V, already has had original pump removed and blanked off, already using an electric pump to feed a built flathead with 390 cfm carburetor. As per a post above by Duece Roadster, this engine/carb could have been fed by a good-working original mechanical pump, but all this work was already done, no point in me going back to original on this car. |
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03-02-2020, 10:35 PM | #28 |
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Re: Fuel pump collision switch
JayChicago, Yeah, it has been my experience that I have seen electric fuel pumps create more problems (flooding, too much pressure, quit working, etc) then they solve overall. Despite wise ass comments, my intent was to show that in MANY instances, electric pumps are not needed. However If you are trying to go 200 miles per hour, they certainly would be necessary.
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03-02-2020, 10:54 PM | #29 |
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Re: Fuel pump collision switch
I think we all understand an original fuel pump works fine. The question was not about an original fuel pump, it was about if protection was a good idea with an electric fuel pump. If you don't like electric pumps fine, don't use one. If you decide to run the engine on an electric fuel pump it is a good idea to have crash protection. If you don't want to add the protection then don't add it.
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03-03-2020, 01:01 AM | #30 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
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Re: Fuel pump collision switch
I installed an electric fuel pump on my '51 in about 1991. By 1995, I had learned a few things and removed it. I haven't looked back since. Luckily, I learned enough about automotive maintenance that I never had to resort to an electronic ignition.
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03-03-2020, 01:07 AM | #31 |
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Location: Shelton, WA
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Re: Fuel pump collision switch
JSeery, I COMPLETELY agree with you. Everyone should do whatever they want to their own cars. Any safety device is always a good idea. I guess I should have just put in 1 sentence stating "A well rebuilt stock fuel pump works fine most of the time"
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03-03-2020, 10:18 AM | #32 |
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Re: Fuel pump collision switch
And I agree 100%, but the OP question wasn't about how well stock fuel pumps work, LOL. It was a safety question. This thread seems to keep wanting to go back to stock pumps are better than electric pumps for some reason. That is not the topic, the topic is IF you use an electric pump, is it a good idea to use a safety device with it.
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03-03-2020, 11:59 AM | #33 |
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Join Date: Apr 2014
Location: Minnesota
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Re: Fuel pump collision switch
FWIW: I used the inertia switch from a old style Ford Taurus/Sable. Its fairly small and easy to remove from the donor vehicle. I also vented my gas tank since it was so hard to fill. I used a rollover valve from Tank Inc.
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03-03-2020, 07:02 PM | #34 |
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Re: Fuel pump collision switch
best solution ive come across is the relay they use with propane tanks when you key on they power up for 10 seconds [primeing time] then shut off then repower when they get s signal from the ignition coil that the engine is cranking if for any reason they loose that signal [engine stalled] they turn off
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