Having problems with your 1990 Volkswagen Cabriolet ?

Fuel rail pressure drops from normal at 3500 rpm to zero at 4500 rpm. already replaced fuel filter, checked rail pressure regulator, replaced in-take pump, external pump replaced by previous owner and tested by me. the external pump makes a whining noise in the vehicle, but is silent during bench test. what is the box above the fuel tank flange passenger side, just forward of the right rear tire, the external pump takes its suction from this box. is the box related to the noise and/or pressure

Posted / edited by AnonymousUser on : 24-07-2017

Answers :

Http://www.cabby-info.com/Fuel_System.htm
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\015\012some info; hope it is helpful
Repair Help & Product Troubleshooting for 1990 Volkswagen Cabriolet

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