L322 No fuel pressure until cranking! No Residual!

lenb · May 17, 2016

I managed to borrow a good pressure gauge and checked fuel rail pressure: result - zero until cranking! It also drops to zero immediately when switching engine off. There is no problem when driving and under load. The in tank fuel pump and filter were changed in October last year! Any ideas?

tomcat59alan · May 17, 2016

lenb said:
I managed to borrow a good pressure gauge and checked fuel rail pressure: result - zero until cranking! It also drops to zero immediately when switching engine off. There is no problem when driving and under load. The in tank fuel pump and filter were changed in October last year! Any ideas?

Don't know the system but is there a pressure regulator on the fuel rail?

lenb · May 17, 2016

The pressure is regulated by the fuel filter, the only thing on the rail is a Schrader valve for checking the pressure.

L322 No fuel pressure until cranking! No Residual!

lenb

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tomcat59alan

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lenb

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