Generac Power Systems MC - Manual (Page 33)

C.)- Check Wire No. 14, between Fuel Pump and terminal strip, for open
or shorted condition,
RESULT:- Wire No. 14 checks good............ Continue Diagnostic tests
Wire No. 14 cheeks bad............ Repair/replace Wire No. 14
UNITS WITH MECHANICAL FUEL PUMP
Disconnect Piomp Outlet Line at the
carburetor inlet. Connect a press­
ure gauge to the line. Disconnect
Pump Inlet Line at the £ue-l lock-
off solenoid and immerse line in
clean gasoline. Crank engine. The
pressure gauge should indicate 1-
3 psi.
RESULT:- Pressure gauge read 1-3 psi........ Continue Diagnostic Tests
Pressure gauge does -not read 1-3 psi........... Replace Pump
TEST 22;- CHECK INSTALLATION
Check alternator installation for:-
1. )- Any other filter screens in the fuel supply line from gas tank.
If other filters are found, check for clogging.
2. )- A Shutoff Valve in the fuel supply line. Make sure Shutoff Valve
is OPEN.
3. )- Anything that might restrict cooling air flow, such as air inlet
or exhaust openings too small, clogged air inlet screening, etc.
If cooling air flow is inadequate, interior compartment tempera­
tures will be high resulting in possible fuel line vapor lock,
4. )- Alternator fuel pump located too high above fuel supply tank.
Maximum vertical lift for MC units with an electric pump is app­
roximately 18 inches, for mechanical fuel pumps approximately 9
inches.
TEST 23- CARBURETOR
This test covers the procedures for adjustment of the carburetor Idle
Speed Stop Screw, Idle Mixture Adjusting Screw, and High Speed Jet Ad­
justing Screw. In addition to these adjustments, the float valve and
its seat should be checked, as well as the float level.
2.2-11