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11-10-2013, 01:41 PM | #1 |
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Airtex fuel pumps
Went to buy an Airtex 6 volt low pressure (2.5 to 4psi) fuel pump, model E8902 based on a lot of positive comments I've read on this forum. As part of the online (Ebay site) information on the pump I came across these statements in red "This pump can be used for either positive or negative ground. FOR POSITIVE GROUND The pump itself must first be wrapped and electrically isolated from the mounting bracket you may or may not have to reverse the wires." What gives? Has anyone done this or had to do this on their installation?
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11-10-2013, 02:38 PM | #2 |
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Re: Airtex fuel pumps
Yes I have done this. When I first installed my E8902 I tested it and found that even though it was running no fuel was coming out at the fuel line into the engine. I knew for sure that the lines were good as everything was new. I pondered for awhile until i realizes the Ford was positive ground. I had wired it + and - per the connections on the pump. I reversed them and the pump runs fine. I don't recall my instructions mentioning wrapping the bracket. I didn't by the way.
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11-10-2013, 03:14 PM | #3 |
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Re: Airtex fuel pumps
The manufacturer must recognize some possibility of the negative windings contacting the case of the pump. For the sake of safety and the possibility of a failure at some future point, I would isolate the pump from whatever it is mounted to. This would also require rubber hose connections instead of steel tubing connections.
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11-10-2013, 03:14 PM | #4 |
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Re: Airtex fuel pumps
I didn't wrap mine and works fine with pos. ground.
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11-10-2013, 03:20 PM | #5 |
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Re: Airtex fuel pumps
For the 6 volt positive ground all you should have to do is reverse the wires, i.e., the ground becomes the hot and the hot wire becomes the ground. I’d also install a “kill” switch for safety.
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11-10-2013, 03:58 PM | #6 |
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Re: Airtex fuel pumps
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11-10-2013, 05:33 PM | #7 |
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Re: Airtex fuel pumps
Like Vic indicated...just reverse the wires on the pump. Should work fine. I have installed 3 or 4 of them with no issues. Good luck. Pat
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11-10-2013, 07:00 PM | #8 |
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Re: Airtex fuel pumps
I mounted mine using a hole that was already in the frame to bolt the bracket to, hard plumbed to the metal tubing rather than using the short rubber hoses and spring clamps that come with the pump, no insulation of the pump body from the bracket or frame. Just reverse the wire to ground the positive and run the negative through the dashboard switch. (Have an inertia kill switch to shut down in a collision.)
P.S. Unless you are just going to turn the pump on momentarily to prime the mechanical pump when vapor locked you'll need a pressure regulator as the pump will put out the maximum 4 psi which is too much for the carb float valve. I put the Holley pressure regulator between the electric and the mechanical pump. Even so, I had to adjust the regulator clear out to get the pressure low enough to not overwhelm my carb float valve.
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 11-10-2013 at 07:08 PM. |
11-10-2013, 07:52 PM | #9 |
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Re: Airtex fuel pumps
I have one installed on my 41. Bought it at Advanced Auto. Are they really any cheaper on e-bay? Cannot remember for sure but about $45?
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11-10-2013, 08:00 PM | #10 |
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Re: Airtex fuel pumps
When I bought mine (12v version) in '05, they were $25 at AutoZone. Now you're lucky to find one for $45, eBay or Summit. Same with the Holley regulator, it was $15, now it's $30. They must think us old birds are made of money...
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11-10-2013, 08:39 PM | #11 |
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Re: Airtex fuel pumps
hey, Ross....you forgot to turn off your blinker....could run down your battery........Mike
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11-10-2013, 09:38 PM | #12 |
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Re: Airtex fuel pumps
I told my buddy with the bellytank at Bonneville to run turn signals and leave the left one on so everyone would know he's from Utah!
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11-11-2013, 06:14 AM | #13 |
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Re: Airtex fuel pumps
Sad to admit but that left blinker is NOT only a Utah trait. It is alive and well in Georgia.
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11-11-2013, 09:28 AM | #14 |
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Re: Airtex fuel pumps
Got my airtex pumps from Amazon
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12-29-2013, 10:06 AM | #15 |
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Re: Airtex fuel pumps
Where do those running Airtex, or any fuel pump for that matter, pull power for the pump? Would a relay be advisable, or necessary?
Joe |
12-29-2013, 10:27 AM | #16 |
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Re: Airtex fuel pumps
Cheapest price I found is at Amazon.com ($39.30) + free shipping. Airtex E8902 More and more I check prices on Amazon.com and find them cheapest.
I also installed an inertia switch as Old Henry suggested. |
12-29-2013, 11:01 AM | #17 | |
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Re: Airtex fuel pumps
Quote:
Obviously if you use the switch, you've got to provide power to the pump until you've got oil pressure (probably before cranking to fill the carb). Older Chrysler products had a timing relay that energized the pump for 5 seconds after the ignition was energized, or when the starter was activated. That would be perfect but I can't find one. http://www.holley.com/12-810.asp
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12-29-2013, 08:21 PM | #18 |
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Re: Airtex fuel pumps
I used Airtex pumps for several years but the two most recent ones I had both failed in a short time. A friend suggested the Carter 4070 pump and they both have held up very well. The Airtex's seemed to vapor lock, I was told due to ethanhol but have no proof of that.
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12-29-2013, 08:28 PM | #19 |
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Re: Airtex fuel pumps
I've been skeptical of claims of damage by gasohol, but I've passed thru Tulsa and other towns in OK a total of 4 times in the last year. I keep real close track of gas mileage, and it always drops significantly (20% or more) on tankfuls purchased in OK. I suspect they are adding more than 10% ethanol around there. That will indeed start to damage lots of components.
Still, I drove thru there 2x in my truck, which has an Airtex pump, no problems.
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12-29-2013, 09:07 PM | #20 |
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Re: Airtex fuel pumps
I dont know about more than 10% ethanol in Oklahoma gas but 100% gasoline is readily available statewide. About 4 to 6 years ago it was all 10% etoh but slowly they started to offer 100% gas, now you can get it at most all stations. you have to pay a little more for it though.
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