Carburetor And Insulator - MTD P90 series Shop Manual

P90 Series Vertical Shaft Engines

Carburetor and Insulator

To remove/replace the carburetor and insulator block:
1. Remove the blower/air filter housing by following the
steps described in the blower/air filter housing sec-
tion of this chapter.
2. Disconnect the breather hose from the intake mani-
fold. See Figure 3.8.
NOTE: On units equipped with an evaporative emis-
sions system, disconnect the hose from the
EVAP port of the intake manifold.
NOTE: If a unit does not have EVAP emissions sys-
tem, the EVAP port on the intake manifold
will have a plug on it.
3. Remove the intake manifold by removing the two
nuts (indicated by the arrows in Figure 3.8.) using a
10 mm wrench.
To avoid personal injury or prop-
! WARNING ! WARNING
erty damage, use extreme care in
handling gasoline. Gasoline is
extremely flammable and the vapors are explo-
sive. Serious personal injury can occur when gas-
oline is spilled on yourself and/or your clothes
which can ignite. Wash your skin and change
clothes immediately
4. Clamp off the fuel line to prevent fuel from leaking
when the line is disconnected. See Figure 3.9.
IMPORTANT: Take care that the fuel lines are not
damaged when clamping them off. Never
insert a screw or anything else into the fuel
line to prevent fuel from coming out. This will
damage the inside of the fuel line.
NOTE: There are commercially available hose
pinching pliers that will not damage the fuel
lines.
5. Disconnect the fuel line from the carburetor.
NOTE: MTD uses low permeation fuel lines to meet EPA guidelines. Low permeation fuel lines are made with
a soft membrane that lines the inside of the line. Any tear in this membrane will allow the fuel to get in
between the membrane and the hose, choking off the fuel flow.
NOTE: Every time the fuel line is pulled off of a brass nipple, the fuel line must be replaced with the same type
of low permeation fuel line.
30
EVAP port
Figure 3.8
Hose pinching pliers
Figure 3.9
Breather hose