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Volkswagen Golf/Jetta/Cabriole 1990-1999
On a Digifant fuel system, the fuel pump is mounted in a reservoir under the rear of the vehicle. The fuel filter is also in this area. The reservoir holds one liter of fuel and is supplied by a small transfer pump in the tank. The transfer pump can be replaced separately even though they are installed and removed as a unit.
The Motronic system uses two fuel pumps. The first is a small transfer pump to get the fuel out of the tank and the second boosts the fuel pressure to the necessary amount. The transfer pump is located inside the tank and the main pressure pump can be found under the vehicle. This transfer pump is located under the rear seat and is part of the fuel gauge sending unit. The main fuel pump can be found in the reservoir in front of the rear axle beam. There is a check valve inside this pump to maintain pressure in the lines, especially on hot days, to avoid vapor lock. The fuel filter is mounted to the side of the reservoir. This filter has no specified replacement interval and should be good for the entire service life of the vehicle. Whenever the ignition key is in the on position, the pump should run for at least two (2) seconds to pressurize the fuel lines. If the Engine Control Unit (ECM) does not see a signal from the Hall Effect sensor in the distributor it will shut the pump off. If a Hall Effect signal is present, the pump will continue to run as long as a signal is detected. It is this Hall Effect signal that signals the ECM that the engine is rotating therefore indicating that fuel is needed. The pump is operated via a relay that is controlled by the ECM. This relay is located in the vehicles fuse panel. The main contacts of the relay can be jumped to run the pump during testing.
NOTE On CIS systems the main fuel pump is located under the vehicle in front of the rear axle or in front of the tank on the right side. 1990-92 Cabriolet, Golf, Jetta and FoxTransfer Pump
1993-99 Cabrio, Golf, and Jetta
Fuel Pump Test
The fuel pump runs only when the engine is running or is being started. Therefore the fuel pump relay must be jumped. This will enable the pump to run constantly so that an accurate test can be performed.
NOTE If the pump does not run, make sure it has a good ground and is getting the necessary 12 volts from the battery.
Fuel Pump Electrical Circuit
NOTE Do not forget to check the condition of the fuse in the box, if it is blown the fuel pump will not receive the necessary electricity it needs to operate correctly.