personal notes on Bosch Diesel fuel pump PFE 1075/50
disclaimer:
Notes and images are strictly as-is, without any warranty or suggestions. Use or ignore at your own risk. High pressure lines and
injectors pose a health risk.
symptom & solution
The Bosch PFE 1075/50 is used in small (in this case 10kW) Diesel engines, and sometimes the main piston gets stuck after
prolonged periods (> 6 months) of disuse. Especially with RME (rapeseed oil methyl ester). That's why the engine's manufacturer recommends
special storage procedures for longer terms.
In case the engine doesn't start due to a non-working high pressure pump (check low pressure feeder pump first), the following procedure
worked for me: Unmount high pressure pump, unscrew front part, release piston from rear spring loaded plate and try to unstuck the piston
from the bore (items 4 and 5 from left in above image). Lubriate with oil and re-assemble.
Note 1: Each and every washer must be installed in the same way (and your PFE may be assembled differently),
Note 2: No need to unmount the throttle pin and its supporting ring.
Note 3: Very likely this doesn't work for newer models.
Note 4: I dont' believe that end-users are meant to do this, maybe you want to consider getting a replacement part.
