sending unit scew size

RHarris · Post by **RHarris** » Sun Nov 27, 2011 9:40 am

Can anyone tell me the sending unit screw size on a omix replacement gas tank for an M38a1. I did not have a tank or sender to begin with and the new tank seems to have two different size threads. Thank you for any info. RH

evanso1975 · Post by **evanso1975** » Sun Nov 27, 2011 10:08 am

Can't help with the repro tank, but the screw size for the original sender unit is as follows:

Early - 8/32"NC-2 x 3/8"
Late - 8/32"NC-2 x 1/2"

Both had a lock washer (probably internal tooth). You can find this info on page 169 of the ORD-9.

Hopefully, someone else out there has a repro tank, and can confirm the sizes used......

Wbr,
Owen.

Post by **wesk** » Sun Nov 27, 2011 11:21 am

Sometimes the over spray will plug the threads. Try threading an 8-32 tap through them.

RHarris · Post by **RHarris** » Sun Nov 27, 2011 1:45 pm

Thank you guys. they did clean up to 8x32. RH

wilfreeman · Post by **wilfreeman** » Sun Nov 27, 2011 2:49 pm

Thank God! I haven't mounted my sending unit and pickup yet - didn't even think about the screws being different. I know the screw holes dont all line up. I just got mine fitted in the tub yesterday. I was about to go off on Omix again. My sending unit screw holes didn't line up either- only 3 or 4 line up.

Post by **wesk** » Sun Nov 27, 2011 10:22 pm

That has been a common problem with MD Juan tanks.

Weld the holes shut and drill new to match sender. Be sure to align the sender for correct float direction and travel.