Quote:
Originally Posted by Drbrown
Although the my OE sender's mounting screw holes matched their outer set and I could lower the OE sender arm and float into their tank, the bottom of my OE sender had to be about 3/8 inch above their collar hole. They correctly cautioned not to cut their collar hole larger because leakage could occur.).
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I had the same issue with my OEM sending unit fitting inside the collar hole of a new aftermarket steel tank on my 40. I trimmed the collar hole to allow the sender to drop down in to the collar ring as it was designed.
I then took the tank to my local radiator shop and had him solder the outer ring of the collar to the tank, this eliminates any possibility of a leak.