External fuel filler mod

That patch (center of it) is located just about where the longest indentation rib is on the sailpanel.

To get a “proper eyeball “ on the situation I removed the filler elbow

And then drained the tank of all the 8 year old fuel 😳. Maple syrup?

clear hose and a piece of brake line stuffed in the end, still sticking out 1/2 inch so I can hear it touching the bottom, pull up 1/8 inch, tape hose to the piller and hose going down the side.. into my monster gas can…. Little suck with the vacuum pump and monitor… 55 minutes long…

10 gallons later.. empty

It’s just not really possible to show it in pictures but the angle from the original intended hole to the gas tank fill hole is rather shallow… so I won’t use that location but I go up to the next indentation rib.

Now here are the fuel caps I want to use

They are the same, one chrome and the other black, designed like mini cobra fuel flip up caps.

For my taste the aviation cap is to big and to modern looking, having recessed fuel filler with a door is too complex and I think that cap is pretty and no need to hide!

I have not decided on black or chrome…

The cap has a threaded flange I turned to 1.5”. Then the flange into the gas tank I made with a 2 1/8”hole vs. the 2.5” from the original…. It just gives me more  wiggle room for the 2” stainless steel elbow to tig weld and to get the angle and the clearance for the 3 o’clock bolt!

Because I intend to mount the filler in the piller and just use the ribbed sail panel as trim I want to make sure everything is lining up properly… I am drilling thru 3 layers, trim, outer skin and inner skin!

so I set out to make a mock up trim panel

its important that the hinge and the locking part sit in the depression… so the hole in the skin has to be exactly at the right place!

Here is the filler assembly…

fuel resistant hose 1.5” to 2”

next is to test it at the gas station, stick it in a 5 gallon gas can and check how it flows before I start cutting anything! I still need to trim some of the tubing going into the gas tank… about bottom of blue tape!

(tape is on it so I can’t drop it into the tank!)

With the fill test I want to see the nozzle reach, back splash and if I have to add a vent tube in the filler neck.

One of the studs on my black trim panel is messed up… Does anybody know if they are just threaded into the casting or are they cast into it??

I seem to recall they are threaded into the casting. Easy enough to check, jamming two nuts together

you are slowly making progress and that’s a good thing especially testing the flow of fuel. Just cutting a hole and hoping everything else will work is a dangerous way to go. Looking forward to your finished product.

Larry

I give WD40 a go first and then vice grips..

threads are gone at the base 5/8” up

that’s the problem… I can go washer, spacer, nut -  to hold it on but… well I know it’s not right and I bugs me… 🤪

I went to several different gas stations today to check the flow of my filler neck and I have to say that I never noticed that there are so many different nozzles… long and short (2” only) with and without spring around, long sleeve to suck vapor off…

anyway.. it worked well… very good on the shorter nozzles and okay on others.. I don’t think it’s any different compared to the original… I use this design and keep working on it!

Locating where I want the fuel filler.

I abandoned the first hole!

I am going one inch higher than DeTomaso did.. I think the additional slope helps for the filling, and clearance for the bolt on the flange at 9 o’clock.

I’ve been straight up, same location within the recess and drilled my hole! Because how the panel is more slanted in the back than in the front. I abandoned that hole as well, and moved it slightly to the left! Taped off the incorrect holes…

and made a mark with a drill

And now it’s destruction time…

The largest diameter on the fuel filler cap is 3 inches , and because their panel is going over there already mounted fuel filler cap start out with a nice big 3 inch hole,!

battery died… Time to take a look

filed out the recess for the closing and hinge mechanism.

and that’s how it looks!

i’ll paint black around the filler cap before assembling it.

I’m just glad I cast this markup panel!

If I would’ve done the chop on the real part, I would’ve broken out in sweat! All the holes would not have mattered because it’s all within the part that’s going to disappear anyway.. but still..

the finish work on the metal panel is going to be much easier, much nicer, because that casting here is quite brittle being fiberglass  and resin!

I let this simmer right now in my brain… Thinking, maybe to go with a different way of assembling it and make the hole only 2 3/4 of an inch diameter

Chrome looks pretty good too.. I may even like it better… make it a feature versus hiding it!

(I’m a little late to the party with this suggestion, but…)

There was a thread somewhere in which one individual hinged the whole gill at the front, and I think he had a post/grommet setup at the rear to hold the gill closed.

Hinged that way, the airflow couldn’t open the gill.

He inset his new filler neck into the metal behind the hinged gill panel.

Your solution looks very good too!  Keep plugging along!  And keep posting pictures!  We love to watch progress!

Rocky

@rocky posted:

(I’m a little late to the party with this suggestion, but…)

There was a thread somewhere in which one individual hinged the whole gill at the front, and I think he had a post/grommet setup at the rear to hold the gill closed.

Hinged that way, the airflow couldn’t open the gill.

He inset his new filler neck into the metal behind the hinged gill panel.

Your solution looks very good too!  Keep plugging along!  And keep posting pictures!  We love to watch progress!

Rocky

Yes, Rocky, I saw that! It was and monstrosity of hinges… I think I tried to keep it simple… and in 1970s style!

black or chrome… What do you think?

I just read your thread. How you Went over your whole car… Pretty much did everything! I’m gonna pick your brain on occasion, if I may… I’m a Pantera Owner only for three or four months, so I’m still learning and learning  a lot! I am reading this forum inside out, top to bottom and there’s no end to it… It’s like a library without walls… endless!!!!

Thanks for the compliment!

I like the chrome, myself, but to each his own!

Rocky

Both look great.  As you said do you want to hide it or stand out.  I think 70s would be chrome.  On old months go black, even months go chrome. LOL.  Larry

I decided to make a second test cut on my other fiberglass panel I made… I would like to have a little less gap between the panel and the filler cap base..

the first time I used a 3” hole saw because I thought the filler cap itself is 3” and the panel get mounted after the cap assembly is installed… the cap base is 2 1/2” so I got 1/4” gap around the base! Just didn’t feel right…

now with the cutouts for the hinge and the little locking mechanism I actually could get the 3” cap though a 2 3/4” hole, leaving me with only 1/8” gap around the base! I’m good with that!

local stores didn’t have a 2 3/4 hole saw so I ordered one.. coming Saturday!

I'm also thinking about moving the cap down one rib.. still higher then center of the panel… looks better but higher location would fill better… decisions, decisions, decisions,…🤔🤪

( and that’s why I made a mold to make some panels to be able to f@$& up)

Agreed Roland, moving it down and a smaller hole I think will look better and have a little more product before the end of the panel.  Right now you are close with the hinge and locking mechanism cut outs to the ends of the panel.  Larry