In the 60s and 70s there was a return line to the tank to prevent vapor lock for AC equipped cars. That is too far back for me to know for sure.
Junior Member
Have a 1955 special with dual action fuel pump. It has two outlets one is for vacuum for wipers the other outlet has no hose on it anybody know what it is for.
In the 60s and 70s there was a return line to the tank to prevent vapor lock for AC equipped cars. That is too far back for me to know for sure.
Last edited by Dr. Frankenbuick; 09-08-2013 at 06:54 AM.
Steve B.
67 GS 525 Buick Stage IV
66 GS Convertible
65 GS HT
63 Riv
02 Subaru WRX Turbo
03 Ford Cobra Convertible (Factory Supercharged)
I wonder if your confusing the inlet (wiper side) and outlet or pressure side of the vacuum pump.
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Senior Member
The ports should be marked inlet and outlet. Inlet connects to the wiper motor and outlet connects to the intake manifold. If the markings aren't readable, start the engine and put your finger over the ports one at a time. Inlet sucks and outlet blows.Originally Posted by potositx
Ray
Junior Member
Thanks Jim
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