BMW Coupes and Sedans 1970-1988 Repair Guide

Fuel Filter

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REPLACEMENT



  1. Loosen the bleeder screw located on top of the filter mounting fitting with a regular screwdriver. Place a container under the filter and loosen the draincock to drain a small amount of fuel (this will keep fuel from spilling when the filter is removed).
  2.  


CAUTION
Never smoke when working around diesel fuel! Avoid all sources of sparks or ignition. Fuel vapors are EXTREMELY volatile!

  1. Disconnect the plug on the water level sensor. Unscrew the filter with a standard oil filter strap wrench.
  2.  
  3. Remove the water level sensor from the old filter and move it over to the new one.
  4.  
  5. Thoroughly coat the seal on top of the new filter with clean fuel. Start the filter onto the threads, turn it until the gasket touches, and then turn it just one half turn more by hand.
  6.  
  7. Disconnect the plug for the fuel transfer pump. Open the bleeder screw. Jumper terminals 30 and 87. When fuel that is bubble-free runs out of the bleed screw, tighten it. Remove the jumper and reconnect the plug.
  8.  
  9. Start the engine and operate it to check for leaks. Tighten the filter just a bit further, if necessary.
  10.  

DRAINING WATER FROM THE SYSTEM



See Figure 1

Hold a half pint container under the bleeder screw and open the draincock. See Step 5 of the procedure above for fuel filter replacement, and activate the fuel transfer pump as described there. Then, press the drain adapter in to open it. Drain until pure fuel runs out.



Click image to see an enlarged view

Fig. Fig. 1: Drain any water from the filter (1) by opening the drain valve (3)

 
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