Subsequent installation of separate check valve on fuel pump

In the event of a complaint concerning “Engine fires poorly when warm” an internal leak of fuel pump shows up, a check valve can be subsequently mounted to fuel pump.

1    Unscrew protective case.

2   Pinch fuel hoses (from fuel tank and to line toward engine) with one clamp each.

3   Unscrew fuel pump assembly on both front anti-vibration buffers.

6 Holder for fuel pump and filter 12 Leak line 14 Pressure reservoir 1 5 Holder for pressure reservoir 19 Fuel hose

21   Filter

22  Fuel pump 24 Damper

26  Fuel pressure line

27  Pressure compensating valve

28  Clamp for pressure compensating valve

29  Closing cone

30  Coupling nut

31  Closing nut

32  Check valve

33  Sealing ring

4   Unscrew steel line (26) on fuel pump, filter, reser­voir and pressure compensating valve.

5   Screw check valve (32) with new copper sealing ring (33) to fuel pump.

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6   Mount steel lines. For this purpose, slip fuel pump up to bead into holder. Connect steel line with new copper sealing rings and closing nut (screw-on closing nut only lightly). Hollow screw is no longer used.

Note: The plastic sheeting or plastic sleeve of pump and filter should project on holder of both sides. Be sure to replace if demaged. Remove pump and filter for this purpose.

7    Mount fuel filter in holder in such a manner that the steel line is in alignment with fuel pump.

8   Mount steel line on reservoir and pressure compen­sating valve and tighten connections (applying counter-hold to check valve).

9   Tighten fuel pump and filter in holder and screw holder to anti-vibration buffers.

10    Remove clamps from fuel hoses.

11  Run engine and check connections for leaks.

12    Mount protective case. Make sure that the steel line is not chafing against protective case.

1    Unscrew protective case.

2   Pinch fuel hoses with clamps.

14 Pressure reservoir

21   Filter

22  Fuel pump 24 Damper

3   Unscrew fuel pump assembly on both front anti-vibration buffers.

4   Unscrew fuel hose on pump.

5   Screw check valve (32) with new copper sealing ring (33) to fuel pump.

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F 2

6 Clip fuel pump in holder approx. 15 mm to the left (so that closing nut is no longer chafing against protec­tive case) and mount fuel hose with 2 new copper seal­ing rings and closing nut to check valve (while apply­ing counterhold to check valve). Hollow screw is no longer installed.

Note: Plastic sheet or plastic sleeve of pump and filter should project on holder on both sides and must be replaced if damaged. For this purpose, remove pump and filter.

7   Tighten fuel pump and filter in holder and mount holder on anti-vibration buffers.

8    Remove clamps from fuel hoses.

9   Run engine and check system for leaks.

10   Mount protective case. Make sure that fuel hose is not chafing against protective case.

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