Are you at the fuel pump end or the carb end of the fuel line? I may be thinking too late into the 70s but does this truck have a Qjet on it with the filter inside the portion where the fuel line enters the carb? If so, there's a thin plastic washer that seats onto the end of the large fitting and seals against the carb.
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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