PS-28 Cruiser
PS-28N Cruiser
CR-MM-1-0-00
CHAPTER 9 – FUEL SYSTEM
Revision No.: 3
Date of issue: 2012-05-28
9 - 14
9.3.8 Fuel drain valve installation
Type of maintenance: line
Authorization to perform:
-
Sport pilot or higher
Tools needed:
-
wrench size 1/2 in
(a) Screw the drain valve (1, Fig. 9-7) in the tank (2) or gascolator – use LOCTITE 565 or
equivalent sealant on the drain valve thread.
(b)
Fill the tank with fuel and check drain valve tightness.
9.4 Check / Adjustment
9.4.1 Checking fuel system tightness
NOTE:
Tightness is checked by pressurized air. When performing a specific tightness
check, outside temperature fluctuations must not be bigger than ± 5 °C (± 9
°F). Reseal the found out leakage by a suitable method - by tightening, by
using a suitable sealing.
Checking airplane fuel system tightness by air
(a) Remove upper engine cowling.
(b) Close the fuel tank filler caps.
(c) Fuel selector valve -
OFF
position.
(d) Connect the pressurization equipment hose to the venting tube outlet on the L/R wing
bottom side.
(e) Disconnect the hoses from the carburetors and return line; blind them by plugs.
(f) Set the fuel selector valve to
LEFT
/
RIGHT
position (choose the tank).
(g) Supply air pressure of 2 kPa (0.02 bar; 0.29 psi) to the appropriate fuel tank by means of
the pressurization equipment.
(h) Shut the air pressure supply. During 15 minutes there must not be any loss in pressure.
Find out leakage by listening to and by soap water.
(i) As necessary, repeat procedure fot the second fuel tank.
(j) Remove plugs from the hoses and reconnect them to the carburetors and return line.
(k) Install upper engine cowling.
9.4.2 Fuel pump check
Check for cracks
Check the fuel pump body for cracks, including the inlet and the outlet hose. If cracks are
detected, immediately exchange the fuel pump for the new pump.
Checking fuel leakage
Perform engine inspection and check the fuel pump body, including inlet and outlet hose, for
fuel leakage. In case of fuel leakage, find out the reason and if necessary exchange the fuel
pump for the new pump.
