Hello Elton, the fuel shutoff is a 90 valve, but unlike a standard ball valve you can go past the shut off point. Look for a line stamped on the end of the valve stem, it indicates the position of the valve. It should be parallel with the fittings when "on" and perpendicular when the valve is off.
I would drain the fuel filter tower first before removing the pump, you'll probably want to change the filters anyway. Make sure you get the bolts up next to the Diesel engine block, they can be pretty covered up.
Good luck.
BP.
Attached below is a picture of the valve in a cleaned up state. On a 7U it will be nearly impossible to see that scribed line under the seat tank and covered with years of crap.
The best tool for opening/ closing that I have found is a 7/16" 8 point socket on a stubby ratchet. Give the valve a quarter turn an see if the fuel stops. It may turn very hard.
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