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boyt911sc boyt911sc is online now
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Join Date: Mar 2002
Location: Philadelphia, PA
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CIS fuel line system.........

Quote:
Originally Posted by rockreid View Post
OK, car is running and driving however I think I may have a hot engine /boiling fuel/low fuel pressure issue due to my updated 017 FD plumbing. In the 004 fuel line routing in the top picture, the CSV is connected on the same side as the Fuel Return out of the FD. However, in the 017 (lower picture) installled in my car the CSV is connected to the side with the Fuel In from the fuel pump using a 90deg barb fitting. Is there a pressure difference between the Inlet and Return sides of the 017 FD? If so, could this be a reason for the engine stalling when the engine is hot?



rockreid,

The CSV is both connected to the main fuel delivery line from the FP for the above FD's. Are you sure you have FD 0-438-100-017? This is not the right FD for your engine. The inlet pressure is higher and the outlet pressure is the low pressure for the return fuel. This is applicable to all Bosch fuel distributors 0-438-100-xxx configuration used in CIS. You have mis-interpreted the FD configuration for FD-004. The CSV could not be supplied by the return line because the CSV needs high pressure fuel (system).

Do you know your system and control fuel pressures? The problem you are having is not attributed to the pressure differential of the FD but rather to the system and control pressures. Please post the numbers for the fuel pressures. Thanks.

Tony
Old 05-08-2015, 07:54 PM
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