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Good work on fixing the leak, I am impressed! :)
The PN is stamped on the body, it's the only way I know how to tell the difference. Internal the emergency pressure relief spring is different. You can use a K pump on anything, but a D pump doesn't work with K-Jet. The K-Jet pump draws alot more current, but it doesn't necessarily mean that the motor winding are any different. I've never put an ohm meter on these pumps to find out if they are wound different.
'74 & upwards 140's & 240's have a kind of surge tank built in, not sure if the early cars do, it would pay to have a look.
Cheers,
Paul.
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