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Group 23 Fuel system
Feed pump
Removal of the feed pump
1. Clean around the pump.
2. Close the fuel taps. Loosen the fuel connections
from the pump.
3. Remove the feed pump from the cylinder block.
Empty the pump from fuel.
1. Piston
2. Strainer
3. Valve housing
4. Lid
5. Pump housing
6. Pin
7. Diaphragm
ä
ä
2
3
4
1
6
5
7
Disassembly and inspection of the feed
pump
1. Check that the piston (1) does not bind in the
pump housing.
Note. The feed pump’s hand pump only functions
when the piston is depressed.
2. Remove the strainer (2) from the feed pump’s inlet
pipe and check that it is not restricted by dirt. Re -
install the strainer by pressing it in until a “click” is
heard.
3. Check the function in the valve housing (3) before
disassembly as follows:
Suck in the inlet (IN), and blow in the outlet
(OUT). The function is normal if they seal in both
cases.
4. Mark the position of the cover (4), valve housing
and pump housing (5).
5. Remove the screws holding the cover. Remove
the cover and valve housing.
6. Turn the membrane and piston until the pin (6) in
the piston is in front of the groove in the pump
housing.
7. Press in the piston and membrane (7). Press the
pin out of the piston and remove the piston, mem-
brane and springs from the pump housing.
8. Check that the membrane is undamaged and
shows no cracks.
Assembling the feed pump
1. Assemble the piston (1), membrane (7) and
springs in the pump housing (5). Press the piston
and membrane together and press the pin (6) into
the piston.
2. Turn the membrane and piston so that the pin (6)
in the piston is not aligned with the groove in the
pump housing.
3. Install the valve housing (3) and cover (4) accord-
ing to the previously made marks. Tighten the
screws.
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