Mityvac 06820 Diesel Compression Test Adapters - Manual (Page 23)

Page Number - 23
Form 822378
3. Fuel Tank and Fuel Valve Assembly.
a. Use dual converter pump and put
selector on vacuum.
b. Connect pump to the tank outlet.
(See Fig. 19.) Make sure the fuel
valve is closed.
c. Pull a vacuum on the fuel valve.
A good valve will hold a vacuum
without leaking.
d. Put selector on pressure, open
fuel valve (if equiped). Install fuel
cap on tank filler opening.
e. Seal off vent hole in fuel cap and
pump air into fuel tank. Not more
than 2 or 3 psi. A good fuel tank
will hold the air pressure without
leaking. (See Fig. 20.)
Figure 19
Figure 20