| silverchief | -- 05-31-2020 @ 1:04 PM |
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My 46 is stock, running 6 v0lts excepting a full time electric fuel pump. I use an under the dash toggle switch for on and off.with a 10 amp fuse between the switch and the rear mounted pump. I suspect the toggle may be interminutely bad and would like to replace it. Plus, a voltmeter across it's terminals with a fully charged battery gives a reading of only about 4 volts. At O'Reilly and Auto Zone the only toggle switch I have found says 20 amps. What exactly does this mean, and is it safe to use this toggle switch with the 10 amp fuse? Very recently when everything was working as should the pump pushed a full stream of gas. Thanks very much.
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| alanwoodieman | -- 05-31-2020 @ 5:48 PM |
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20 amps is the load capacity of the switch so 10 amp fused line would be with in specs. look for amp load on the fuel pump
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| JayChicago | -- 05-31-2020 @ 5:54 PM |
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Go ahead, buy that switch. It's 20 amp rating just means it's maximum capacity is 20 amps. You will be way under that, and using a switch more robust than necessary won't hurt a thing. I do think you need to change that switch! Your voltmeter should read 6 volts from either switch terminal to ground. Terminal to terminal should be 0! If you measured 4 volts across the terminals, that indicates a 4 volt drop thru the switch. Faulty switch.
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| silverchief | -- 06-01-2020 @ 8:22 AM |
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Thanks guys - that's a big help. I'll let you know.
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| silverchief | -- 06-02-2020 @ 10:56 AM |
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Replaced toggle switch - no help. Voltmeter shows 6 volts being delivered when touching either of its terminals, and it shuts current on and off as it should. Went direct to pump with voltmeter. It shows power being delivered to pump but only 4 volts. Before I buy a new pump, should 4 volts be enough to work the pump? All wiring is in like new condition and pump was working fine until it stranded me about 3 days ago. Back at home it showed no fuel being delivered to carb, and that remains the current situation. 10 amp fuse inline after toggle tests good - as does it's replacement. This message was edited by silverchief on 6-2-20 @ 10:58 AM
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| JayChicago | -- 06-02-2020 @ 11:49 AM |
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The 4 volt reading at the pump is ok. While still connected to the working (or trying to work) pump, a part of the electrical pressure is being drained to ground thru the pump. If you disconnect that wire from the pump it should measure 6 volt. I think your pump has failed. What do you hear at the pump? Do you hear it trying to work? This message was edited by JayChicago on 6-2-20 @ 12:38 PM
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| silverchief | -- 06-02-2020 @ 1:02 PM |
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No - whereas normally you can hear it clicking. I ran a wire direct from the battery to the pump and still nothing. The pump is about 10 yrs old so I'm sure it is bad. An article in the Jan 2011 issue of v8 times talks about a model E8902 Airtext pump but it is discontinued. An article in the July 2016 issue says modern gasoline attacks the fiber gears in most pumps, resulting in fibers clogging the filter, or needle valve. Rut Randy Rundle in Kansas builds one with metal gears for Great Race participants and modifies them for our cars so guess I will contact him. Thanks very much for your suggestions.
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| 39 Ken | -- 06-03-2020 @ 3:53 AM |
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The Airtex E8902 has not been discontinued. It's available from many suppliers. It's design is superior to the old solenoid pumps from the past. Very reliable pump and can be used with ethanol gas. Ken
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| Grant | -- 06-03-2020 @ 4:37 AM |
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The Airtex E8902 is a reliable pump. It's listed on Amazon this morning at $40.78 USD. Running one with a toggle switch works just fine. There has been a set-up like that on our '36 for about ten years.
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| silverchief | -- 07-05-2020 @ 11:11 AM |
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As a matter of interest - I ended up buying the electric pump sold by Randle Rundle in Kansas. Cost about twice as much as a new Airtex, but is well designed, obviously made of high quality components, very silent, and pushes fuel at a level that eliminates need for my pressure regulator. Very happy with my purchase.
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| Hrussell8750 | -- 07-05-2020 @ 11:35 AM |
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I also have purchased the Airtex E8902 from Amazon.com This pump has helped with the vapor lock issue I was having and have not had any problems for over two years now. Hope this helps Thank You, Harry8750
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