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Posted by: Randal Jan 22 2015, 10:00 AM

Thinking about drilling a 3/4 inch hole through the firewall to an Accusump on the other side. The Accusump will sit facing backwards towards the cockpit firewall mounted where the seat normally goes.

Anyone ever drilled through this section.

There is a black arrow where I want the hole.

All advice appreciated.



BTW I'm going to cover up that higher hole where the lines used to run to the front cooler.

Posted by: Racer Chris Jan 22 2015, 10:22 AM

You can put a bulkhead fitting through the pocket there.
That's the only location on the lower firewall where the two panels have no empty space between them.

Posted by: Rob-O Jan 22 2015, 10:55 AM

What Chris said. The center of that dimple matches a dimple on the interior of the vehicle. Any other spot on the lower firewall and you have to go through two pieces of metal spaced 2.5 or so inches apart.

Posted by: Steve Jan 22 2015, 12:11 PM

I drilled a 3/4" hole in that dimple to run the DME harness for my 3.2 motor. No issues. Plenty of room on the other side, since it's low on the firewall behind the passenger seat.

Posted by: McMark Jan 22 2015, 12:13 PM

To expand on what Chris said, that area is a boxes section. So where the arrow is you would have to drill through one layer of sheet metal, and then drop into the box and drill through the next layer into the cabin.

If you drill though the dimple, those two layers of metal are back to back. But there a spot welds in the dimple. I imagine this was done for structure to tie those pieces together. If you remove the spot welds and don't compensate for it (weld around the circumference of your drilled hole) you're taking that structure away. It's probably not going to affect a caged car like yours all that much, but I'm not a big fan of it.

If I were doing it here, I would drill through the box section, then weld in a tube to make a sealed hole in the body. Then feed AN line through the hole and add the ends on after.

Posted by: Randal Jan 22 2015, 12:19 PM

Ahhh, now I see it. Just move the Accusump over to the right, drill a hole, install a bulkhead fitting and I'm good to go. So much easier and less costly than running the lines through the old hole.

Man, the stuff we go through for better weight distribution!



Thanks for the advice all!

Posted by: Randal Jan 22 2015, 12:19 PM

Thank you Sir!

Posted by: SirAndy Jan 22 2015, 12:22 PM

Like so:

Posted by: Kansas 914 Jan 22 2015, 12:54 PM

Nicely done!

Posted by: JRust Jan 22 2015, 06:03 PM

That's is effective & looks good. Nice mod Andy

Posted by: Randal Jan 22 2015, 06:21 PM

Nice work Andy.

What is that blue line called? Looks like it just slips on to the fittings.

Posted by: Racer Chris Jan 22 2015, 07:28 PM

Aeroquip AQP Socketless Hose

Posted by: SirAndy Jan 22 2015, 08:17 PM

I got the hose and fittings from Pegasus Racing.

Operating range: Up to 250 psi, 300 deg. F
Burst pressure: 1000 psi

Posted by: Randal Jan 22 2015, 10:21 PM

Sure looks like a lot easier to work with as compared to the SS wrapped lines. Decided to go that way, but the pliers to crimp the clamps, recommended in high temperature situations, was $80 bucks. Ouch.

Oh well another interesting tool to place in the green felt.

Posted by: SirAndy Jan 22 2015, 10:40 PM

I've been running this setup without clamps for years now, never had a problem.

Posted by: Randal Jan 22 2015, 10:56 PM

Well you know where to borrow the special pliers now.

Posted by: Mark Henry Jan 22 2015, 11:13 PM

Isn't that Parker Pushlok hose?

Posted by: Randal Jan 23 2015, 06:58 PM

As per Foley, "Aeroquip AQP Socketless Hose"

I don't think it's the same, but maybe. I'll have to call the Parker guys in San Jose and find out.

Posted by: SirAndy Jan 23 2015, 07:28 PM

The Parker Pushlok is very similar:
http://www.914world.com/uploads/4281_b1.pdf