Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Volkswagen Cabriolet Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Main Fuel Pump Volume Check: VANAGON
- Remove the return line from the pressure regulator located in engine compartment left side. Push a piece of hose onto open connection of pressure regulator. Insert hose into a 1 qt. (1 liter) graduated container.
- Activate fuel pump for 30 seconds by removing fuel pump relay and attaching jumper wire between terminals No. 30 and No. 87. Fuel pump relay located left side of engine compartment in Black plastic box. Compare volume with specifications.
FUEL PUMP PERFORMANCE (AFC-DIGIFANT II)
| Application/ Model | Pressure psi (kg/cm2 ) | Min. Vol. in 30 Sec. Pts. (L) |
|---|---|---|
| Cabriolet, Corrado | 29-36 (2.0-2.5) | 1.0 (.5) |
| Golf GL/GTI & Jetta | 29-36 (2.0-2.5) | 1.0 (.5) |
| Vanagon | 33-39 (2.3-2.7) | 1.0 (.5) |
FUEL PUMP PERFORMANCE (CIS-E & CIS-MOTRONIC)
| Application @ Voltage | Min. Vol. in 30 Sec.: Pts. (L) | |
|---|---|---|
| Fox | ||
| 10 | .8 (.375) | |
| 11 | 1.1 (.520) | |
| 12 | 1.4 (.675) | |
| Jetta GLi | ||
| 10 | 1.0 (.460) | |
| 11 | 1.3 (.620) | |
| 12 | 1.6 (.750) | |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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