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View Poll Results: What style Bulkhead to use for power wire into Gas tank?
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Old 04-11-2013, 08:47 PM   #1
thelostartof
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Default What style Bulkhead to use for power wire into Gas tank?

Top one is a nylon insert like stock but has a bolt in the center for the current to pass through. this will require a 7.9mm hole to be drilled into stock.




The bottom is a -3an setup that will have nylon washer's and then some kind of grey rtv or fuel tank repair sealant to be put on the wire that goes in the center to help seal it, ON top of that I am going to drill the correct size hole in the -3 cap and thread it on after filling it with said sealant to help seal. This will require a 9.3mm hole
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Old 04-11-2013, 08:59 PM   #2
M.H. Yount
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Of those two choices I'd use the -3AN. I found when I made my upgrades to a -6AN system using the stock 240 tank sending unit that I couldn't get any type of RTV to hold up when sealing the electrical connections passing through the top. I ended up using 2-part epoxy glue to stabilize/seal the wires in the fitting - it seals and is unaffected by the fumes.
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Old 04-12-2013, 02:17 AM   #3
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No chance of wires chaffing with the top.
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Old 04-12-2013, 02:22 AM   #4
Karl Buchka
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How is that nylon insert held in place?
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Old 04-12-2013, 07:40 AM   #5
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Top one is semi held in like stock, threading the bolt in should expand it a little to hold it tight, plus I was going to use a small layer of sealant of some kind on the top. I have semi tweaked the design and I will post up in a few the newer setup I am thinking of running of the top one.

If anyone has a better idea I am super open about it.
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Old 04-12-2013, 09:46 AM   #6
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Actually I looked at my new ideas again and I found a flaw so back to just these two ideas.
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Old 04-12-2013, 10:07 AM   #7
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I'd be more inclined to use the top one
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Old 04-12-2013, 11:23 AM   #8
M.H. Yount
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I removed/drilled out the stock 240 electrical connections and installed two 6aAN bulkhead fittings for fuel supply/return. Then ran the electrical wires through the stock return line 'pass through' - sealed with epoxy. In the spirit of another idea.
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Old 04-12-2013, 11:54 AM   #9
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Happen to have link to what epoxy you used?
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Old 04-12-2013, 02:39 PM   #10
M.H. Yount
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Nope - just bought at the hardware store - comes in 2 conjoined 'hyperdermic' style tubes.
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Old 04-12-2013, 07:53 PM   #11
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Definitely use epoxy. RTV will soften and fail from the fumes of the gasoline.
I had to have a tank boiled out because someone used rtv intead of the big o-ring at the sender and it became a globby mess that reeked havoc on the pickup/filter.
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Old 04-12-2013, 08:15 PM   #12
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Suspect something like JB Weld would work equally well as the epoxy. Either form a permanent seal -- if you need to alter things, you'll have to cut the wiring above/below, drill out the passage, re-solder, re-seal.
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Old 04-12-2013, 08:24 PM   #13
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The fitting is only $7 so cheap enough to get more if needed.

Ok well I have some epoxy here along with some liquid metal filler so we shall see.
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Old 04-12-2013, 09:57 PM   #14
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My AWD uses a plastic fitting with the wires embedded - presses into a splined hole, with the rubber seal & star washer on the backside. I just used POR15 to coat the topside after installing. This one is for the sender, the pump is the same but heavier gauge wiring.



I would go with a version of the lower option, with epoxy to seal the wire and the stud/sleeve
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Old 04-12-2013, 11:20 PM   #15
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http://www.aaroncake.net/rx-7/projec...aug72006-1.htm
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Old 04-12-2013, 11:52 PM   #16
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I have seen that link like 20 times, if this setup still leaks I will go to something like that.
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Old 04-12-2013, 11:52 PM   #17
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I was trying to be helpful. NEVER AGAIN
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Old 04-12-2013, 11:57 PM   #18
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lol, thanks, you were tons of help full as you gave me all of the different idea's and designs. that last one you posted is what you were trying to tell me about and my little brain didn't get it until I found that link. Of which for the last 3 days every time I search I keep ending up back at that thread.
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