ConcoursMustang Forums

Restoring - General discussions that span across many different groups of years and models => Drivetrain => Topic started by: ClevelandKid on June 18, 2023, 12:02:23 PM

Title: Gas Tank Sending Unit Build-up - 70
Post by: ClevelandKid on June 18, 2023, 12:02:23 PM

Just swapped out my 70 Mach 1 sending unit as it stopped working. Why is the float all green? It looks like moss on a tree. Could this be the effect of running E10 gas? I switched to Non ethanol a few years ago but until then I could only get E10. The stock float is brass like the replacement. Have a look. Your thoughts.

(http://i.imgur.com/ZhH8jP3.jpg) (https://imgur.com/ZhH8jP3)

Title: Re: Gas Tank Sending Unit Build-up - 70
Post by: J_Speegle on June 18, 2023, 05:06:19 PM

Brass floats will typically chance color due to what ever they are exposed to. This even takes place when exposed to water.  Since our fuel is often a single product or a combination of things as well as often water  (from contamination or moisture/condensation) this is "normal". Guess someone could search for all the scientific reasons and explanation on the web. Its surely there.

The collection on your float looks different from others I've seen as far as texture and build up but no telling what is in the fuel in your area or from your supplier

Bottom line, since your driving - check and or change the fuel filter since there is a good chance that some of this is floating in the fuel system and will create issues for you in the carburetor at some point.

Retitled the thread slightly and I'm moving this to a more general area so that more eyes see it since it applies to all years and models

Title: Re: Gas Tank Sending Unit Build-up - 70
Post by: rockhouse66 on June 18, 2023, 09:43:02 PM

Weird.  It looks like a Chia Pet! 

Title: Re: Gas Tank Sending Unit Build-up - 70
Post by: ruppstang on June 18, 2023, 10:49:43 PM

I bet if you clean it up and remove the cover from the resistance coil and clean it up it will work better than the repop in the picture.

Title: Re: Gas Tank Sending Unit Build-up - 70
Post by: preaction on June 18, 2023, 11:11:43 PM

The condition of your sender is a good indication of what the inside of your gas tank looks like.

Title: Re: Gas Tank Sending Unit Build-up - 70
Post by: RoyceP on June 18, 2023, 11:29:52 PM

Quote from: preaction on June 18, 2023, 11:11:43 PM

The condition of your sender is a good indication of what the inside of your gas tank looks like.

Agree. Plus the reproduction sending units only work briefly. Recommend you send the original unit to Bill Basore for repair. Then buy a new gas tank and put both in together. Only use 110 octane race gas after that.

Title: Re: Gas Tank Sending Unit Build-up - 70
Post by: jwc66k on June 19, 2023, 01:07:08 PM

Some lite reading about copper corrosion.

https://www.corrosionpedia.com/definition/1642/copper-corrosion

Jim