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Old 08-01-2019, 03:36 PM   #1
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SP135 fuel pump nut size

As the title, anyone know the thread size for the nuts holding on the fuel pump? 1/2 inch wrench or 13mm wrench fit, but standard thread nuts won't go on past a half turn.
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Old 08-01-2019, 04:18 PM   #2
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Old 08-01-2019, 06:01 PM   #3
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Seems to be a mixture on the Lehman engines. The Lehman parts tend to be SAE, Ford parts metric. I use a thread gauge to figure out which one I'm working with before I end up cross threading something. The threads are almost identical but the pitch is different. Fuel pump nuts are a real pain. Not a lot of room to turn a wrench
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Old 08-01-2019, 08:03 PM   #4
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Fine thread?
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Old 08-02-2019, 09:03 AM   #5
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8 -1.25 mm and 5/16-18 are very close and usually go more than half a turn then ruin themselves when turned more than that . they also could be 5/16-24 . lastly some manufactures use finer thread count metric threads i hope you don't have them they can be hard to find 8-1.0 and 8-.75. durn engineers .
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Old 08-02-2019, 09:46 AM   #6
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Whitworth threads??
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Old 08-02-2019, 10:07 AM   #7
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Bingo on the fine threads! 5/16-24. Luckily my local Ace hardware carries them. I would have taken the one I had to the store to match it, but after trying for a half hour to get it on the stud and engaged with one finger, I just didn't have the will to take it off.
Thanks for your help everyone!
BTW, if you need a fuel line from the pump to the filters on the Lehman, Bomac can make one up. AD can't get them at the present time.
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Old 08-02-2019, 10:50 AM   #8
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Whitworth threads??
that 1/2-12 ruined many of my days when i worked on White cards(textiles) back when i was 19 or so.

glad you got it figured out mike.
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Old 08-02-2019, 12:22 PM   #9
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Originally Posted by mike66 View Post
Bingo on the fine threads! 5/16-24. Luckily my local Ace hardware carries them. I would have taken the one I had to the store to match it, but after trying for a half hour to get it on the stud and engaged with one finger, I just didn't have the will to take it off.
Thanks for your help everyone!
BTW, if you need a fuel line from the pump to the filters on the Lehman, Bomac can make one up. AD can't get them at the present time.
I was looking for transmission oil cooler hoses and went on Bomacís web site. There is a notice that Bomac is for sale due to owners ill health...
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