Tecumseh ECV105 Technician's Handbook page 27

4. Install the hinge pin from the opposite hinge leg. The
bowl gasket must be positioned over the end of the
spring (diag. 51).
5. Set the proper float height. See "Float Adjusting
Procedure" in this chapter.
Diaphragm Assembly
The rivet head on the diaphragm must always face toward
the inlet needle valve. On carburetors with an "F" cast into
the carburetor flange as illustrated, the diaphragm goes
next to the carburetor body. Other diaphragm carburetors
have the gasket located between the diaphragm and
carburetor body. Install the cover retaining screws and
tighten (diag. 52).
Fuel Bowl And Bowl Nut
Whenever a carburetor bowl is removed for service, the
fuel bowl "O" ring must be replaced. For easier installation,
lubricate the "O" ring with a small amount oil.
Install the float bowl by placing the detent portion opposite
of the hinge pin. Make sure the deepest end of the bowl is
opposite of the inlet needle. The bowl has a small dimple
located in the deepest part. The purpose of this dimple is
to minimize the chances of the float sticking to the bottom
of the bowl caused by stale fuel (diag. 53).
On some fixed jet (non-adjustable) and adjustable
carburetors, a fibered washer is required between the
carburetor bowl and the bowl retaining nut.
Occasionally, on engines equipped with the dual system
carburetor, some rich starting conditions have occurred
when the engine is warm. This condition can be corrected
by inserting a non-metallic spacer in the center leg of the
carburetor, as shown (part # 632158). This spacer is
designed to reduce the amount of prime charge in the main
nozzle area for better starting under warm engine
conditions. It can only be used on Dual System carburetors
and does not lean out the carburetor mixture. (diag. 54)
This spacer must be reinstalled if originally equipped in
the carburetor.
Impulse Fuel Pump
The diaphragms must be installed against the center body
with the gaskets against the outside covers. The parts are
designed so they cannot be misassembled without damage
(diag. 54).
To test the unit, assemble the carburetor to the engine,
leaving the fuel line from the pump off. Use a different fuel
tank remotely placed above the carburetor to provide gravity
fuel flow to the carburetor inlet to run the engine while
testing the pump. Make sure fuel is available in both fuel
tanks and that the original fuel tank's fuel line is connected
to the fuel pump inlet. Place the pump outlet line in a proper
draining receptacle. With the pulse line connected from
the engine crankcase to the pump and the engine running,
a definite fuel flow should result at the pump outlet.
If the flow is erratic or intermittent, the pump needs repair
or replacement.
GASKET
RIDGE AND
RIVET
HEAD UP
DETENT
GASKET GOES
OVER SPRING
CHOKE END OF
CARBURETOR
ENDS OF SPRING POINT
TOWARD CHOKE END
OF CARBURETOR
51
RIDGE AND
RIVET HEAD
UP
GASKET
52
53
NON-METALLIC
SPACER
54
23