1/2 inch fuel sending unit for early Mustangs from RobbMC Performance - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 4 (permalink) Old 06-14-2009, 09:01 AM Thread Starter
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1/2 inch fuel sending unit for early Mustangs from RobbMC Performance

(Copy of a post I made on the FE Forum)

Got the new sending unit from Robb to try out. It's a very nice unit using a 1/2 inch diameter aluminum tube instead of the stock 5/16 or 3/8 inch tubes. The body is billet aluminum and the tubes appear to be epoxied in place. -8AN or -10AN male fittings are optional. I got the -8AN fittings. There are two fittings. One is for a return line if you use a return style fuel pressure regulator for an electric pump. The return fitting is the one with the metal cap in the photo. The sender uses a dummy 3/8 inch tube to hold the float assembly in place like on the stock unit. The return line does not have a tube extending into the tank. That's a good thing since you don't want the return flow close to the end of the fuel pick up tube in the tank.

Photos comparing the RobbMc sender and a stock Mustang 3/8 inch sender:





The bend is identical to the stock unit so the tube should end up in the well area of the stock fuel tank:


Fits fine into the tank opening:


The sender comes with an o-ring that I glued into place. I put lube on the top of the o-ring to help avoid damaging it when installing the retaining ring. One thing that is missing on this unit are the tabs that go into the cutouts that you can see on the left and right sides of the tank opening that hold the stock sender in place. It keeps the unit from rotating. I had to redo the installation a few times to get the unit oriented correctly since it would rotate as you tighten the retaining ring:


You can see the tabs on the stock unit:


Had to trim the rubber boot on the electrical plug since the connector was shorter on the RobbMc unit:



-8AN line hooked up:




The only thing that I would like to see are the tabs to keep the unit oriented correctly.

It might be nice to have at least the output tube bent like on the stock unit pointing toward the original track of the fuel line. But on the other hand, if you're using an electric pump, that might not be the way to go depending on where the pump is located.
So it's probably fine the way it is. If you don't use the AN fittings though, it might be better to have the tubes bent. Otherwise the curve the hose will have to make will hang down pretty low.

Robb was looking for imput before he starts manufacturing these senders. I think it is an excellent unit. Just like all his other products, the craftsmanship is first rate. And it's the only one made for early Mustangs with a 1/2 inch tube.

I think Robb will probably chime in later.
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post #2 of 4 (permalink) Old 06-14-2009, 10:50 AM
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Re: 1/2 inch fuel sending unit for early Mustangs from RobbMC Performance

Looks like this should be a tech article if Rob puts these into production. That looks sweet!

Last edited by valleyfirearms; 06-14-2009 at 11:06 AM.
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post #3 of 4 (permalink) Old 08-05-2009, 03:21 PM
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Re: 1/2 inch fuel sending unit for early Mustangs from RobbMC Performance

where can I get one of those?
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post #4 of 4 (permalink) Old 08-05-2009, 06:21 PM
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Re: 1/2 inch fuel sending unit for early Mustangs from RobbMC Performance

And what happened to the pics?

1968 mustang 408W Hybrid..Burns gas and rubber!
[email protected] with a crappy 1.72 60ft.
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