Vacuum reservoir
Race Director
Joined: Apr 2003
Posts: 19,352
Likes: 654
From: Tampa, Florida
Is '75 the one with the vacuum tank integrated into the frame bar? Rather than applying vacuum to it block off the holes and pressurize it with a an air pump.
I zip tied rubber hose to the ports then inserted screws into the other end to block of the tubing. I hooked my bike pump up to the remaining open port and pressurized it to about 5 p.s.i. I then sprayed a soap solution on it and checked for bubbles.
I zip tied rubber hose to the ports then inserted screws into the other end to block of the tubing. I hooked my bike pump up to the remaining open port and pressurized it to about 5 p.s.i. I then sprayed a soap solution on it and checked for bubbles.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Seal off the outlet(s) and connect inlet to a vacuum pump/gauge. Pump it a bit and then see if the reading drops....indicating a leak. If not, look elsewhere; if it does leak, pump up the vacuum a bit more and [as it is leaking down] move your hand/fingers around the tank to see if you can get the leak to 'slow down' or stop. That is the area of leakage. Check particularly around the inlet and outlet tubes; these can have cracking at their base from damage from connecting vacuum lines. If you are able to isolate the leak areas of the tank, just put a thin patch of JB Weld putty-epoxy on the outer surface [after cleaning it really well], let harden, and paint with Krylon semi-flat black paint. Done deal!
Race Director
Joined: Apr 2003
Posts: 19,352
Likes: 654
From: Tampa, Florida
Seal off the outlet(s) and connect inlet to a vacuum pump/gauge. Pump it a bit and then see if the reading drops....indicating a leak. If not, look elsewhere; if it does leak, pump up the vacuum a bit more and [as it is leaking down] move your hand/fingers around the tank to see if you can get the leak to 'slow down' or stop. That is the area of leakage. Check particularly around the inlet and outlet tubes; these can have cracking at their base from damage from connecting vacuum lines. If you are able to isolate the leak areas of the tank, just put a thin patch of JB Weld putty-epoxy on the outer surface [after cleaning it really well], let harden, and paint with Krylon semi-flat black paint. Done deal!
