Fuel Cell question

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sverbus
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Joined: Tue Dec 27, 2005 10:03 am

Fuel Cell question

#1 Post by sverbus » Thu Jul 10, 2008 9:52 am

When I went to the Magnafuel pump I knew that i had to increase to a #12 AN bung and line to the inlet side of the pump. I decided last weekend to do this finally and get rid of the #8 that I had in place. In doing this, I had to increase the hole size in the fuel cell to accept the larger fitting. Now, I can't get this thing to seal worth a crap. It leaks enough that it drips off the back of the cell underneath the fitting about once every 30-50secs. That's not gonna cut it.

I tried tightening the fittings more but that doesn't work as it just keeps leaking. These are good quality AN fittings with the white neoprene washers. My father hates the plastic fuel cells, mine is a Jegs special :) and always raves about how nice his aluminum one is. So, should I just quit messing with this plastic crap and buy a nice aluminum one? Jegs sells a nice one for 179.00 with no sending unit (cause who gives a crap how much gas I have in the cell, I can't stop at the gas station on the way home to fill up anyhow)

HAHA I wouldnt want to hear my motor with 15:1 trying to light the candles on 93octane... :pissed:

Thanks for any advice guys!

Scott
'70 Nova
434 small block
Best so far of 10.51 @ 131mph with a best so far 60' /1.46

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John_Heard
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Re: Fuel Cell question

#2 Post by John_Heard » Thu Jul 10, 2008 11:54 am

You're going to have a hard time finding an aluminum cell with #12 outlets, even #10's are only available in certain models. Not sure if anyone makes one?

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stroker1
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Re: Fuel Cell question

#3 Post by stroker1 » Thu Jul 10, 2008 12:54 pm

How did you enlarge the hole for the #12 fitting? Was there a little burr on the plastic after you made the larger hole? That could keep it from sealing. Also how round is the hole after you enlarged it? It may just not be sealing in every spot. The hole needs to be just barely big enuff for the bulk head fitting to slip thru. Sounds like you might have to get yourself another cell if the plastic isn't burred up causing it not to seal.
'87 S10 stock suspension, Caltracs, 9" rearend, 1.82 Glide, 383 SBC,
Brodix Track1 Heads, 14:1 compression, 180 shot plate,
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sverbus
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Re: Fuel Cell question

#4 Post by sverbus » Thu Jul 10, 2008 1:12 pm

I used a stepped drill bit but once I got past the #10 size it was a bit to small for the job so I just "improvised" which I knew was probably going to cause me grief. i was careful, but I probably didn't get it round enough and it is just barely large enough for the bung to slip through but it is a rough cut. Plus the cell is old, about 5yrs now, and the front of it, for whatever reason, is distorted a bit, that's probably not helping my situation any.

I think I'm going to go with a aluminum one and just get the #10 welded in a shop near here.
'70 Nova
434 small block
Best so far of 10.51 @ 131mph with a best so far 60' /1.46

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69firebird
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Location: new jersey

Re: Fuel Cell question

#5 Post by 69firebird » Thu Jul 10, 2008 4:19 pm

i had the same problem. so i put a copper washer on the inside and no washer on the outside. plus i used a very slight amount of permatex( the stuff that doesnt harden and doesnt get eaten up by fuel) i did this 1 year ago with zero leaks now
hope this helps :D

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ytnova
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Re: Fuel Cell question

#6 Post by ytnova » Fri Jul 11, 2008 8:35 am

When I put the new 10 gallon aluminum cell in my car, I found one that was made with bulkhead fittings instead of ones that are welded in, and then like yourself, I used a step bit to enlarge the hole, debured it a little, and installed a #12 bulkhead, with teflon washers on both sides. So far no leaks.
I am not really sure what the question is, but I am pretty sure the answer is Big Block.

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aitch o
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Re: Fuel Cell question

#7 Post by aitch o » Fri Jul 11, 2008 6:44 pm

this 5 gallon cell comes with -10 outlets.
http://www.jegs.com/i/JEGS/555/15315/10002/-1

when i got an alum 10 gallon cell from summit several years ago, it came with -10 outlets.
the box was house brand, but the cell was RCI.

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sverbus
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Re: Fuel Cell question

#8 Post by sverbus » Sat Jul 12, 2008 12:02 pm

I ended up buying a aluminum one from Jegs that had a #8 bung welded in, I went and cut that out with a cut off wheel and went down to the local welding shop and they tigged me in a #12 so now I'll never have worries of fuel. And it looks great because while I had the cell out, I decided to clean up the trunk and the battery hold down.

Now the trunk, which was the ugliest area of the car, is sharp enough to leave open at the local hang outs and cruises. :bling:
'70 Nova
434 small block
Best so far of 10.51 @ 131mph with a best so far 60' /1.46

grandville455
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Re: Fuel Cell question

#9 Post by grandville455 » Mon Mar 20, 2017 6:37 am

I'm Gonna try this same thing, I got a -12AN Fitting coming and will drill out the hole that has the 8AN
,If It doesn't seal I'll try some fuel resistant epoxy etc, I'll give updates when completed.
74 Pontiac Grandville
7.33- 1/8th @ 94.55/ 11.501 @117.74- 4550 pds
1.60 60 ft....all bests

74 Firebird 3580#
2016 1.377 60ft, 6.33@106.87- 10.02@ 132 mph

grandville455
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Re: Fuel Cell question

#10 Post by grandville455 » Sun Apr 02, 2017 7:29 pm

Thought I would update this thread, got the hole drilled out with my step drill and then used my die grinder with carbide bit to open it ever so slightly for the 12AN fitting, It took some doing but i got it I believe, The biggest issue was this new sump only is 1 1/2 deep compared to 2' on my old 12 gallon one, so the nut was very close to the bottom of the cell, but i got some steel shims to place behind a thicker nylon washer on the outside, inside i just used the shim with the nut. It seems to be leak free thus far!! The jegs 8AN leaked right away, had to really snug it down to stop, but it did.
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74 Pontiac Grandville
7.33- 1/8th @ 94.55/ 11.501 @117.74- 4550 pds
1.60 60 ft....all bests

74 Firebird 3580#
2016 1.377 60ft, 6.33@106.87- 10.02@ 132 mph

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