Fuel Delivery Rate, Checking
Fuel delivery rate, checkingApplies to both single and two pump systems.
WARNING! Fire hazard. Do not have anything in area that can ignite fuel.
Requirements
- supply voltage OK
- remote control VAG 1348/3A connected
- remove fuel filler cap
- connect VAG 1318 pressure tester to pre-supply line 1 using a length of scrap hose and adaptor VAG 1318/10
- insert hose VAG 1318/1 onto adaptor VAG 1318/11 of pressure tester an hold in measuring glass
- open shutoff valve of tester VAG 1318 (lever points in direction of flow) position A
- operate remote control VAG 1348/3A while slowly moving tester shutoff lever in direction B until the following pressure is indicated on the tester
- two pump system (prior to 9-89 production): 3 bar (43.5 psi)
- single pump system (from 10-89 production): 4 bar (58 psi)
When the indicated pressure is obtained stop moving the valve lever
- shut off remote control
- drain measuring glass
- operate remote control for 30 seconds then shut off
- compare quantity of accumulated fuel in measuring glass with appropriate chart
- up to 9-89, system with two pumps
- * minimum supply per 3O seconds
- ** voltage of of running fuel pump with engine NOT running (should be approximately 2 volts less than battery voltage)
- from 10-89, system with one pump
- * minimum supply per 30 seconds
- ** voltage of of running fuel pump with engine NOT running (should be approximately 2 volts less than battery voltage)
If minimum delivery value NOT obtained
- check if fuel lines are bent, pinched or plugged; repair as necessary
- check if fuel filter is plugged, replace if necessary
NOTE:
The chart is expressed in units of cubic centimeters (cc's). It is also acceptable to substitute milliliters (ml) for cc's.
This will allow you to use containers calibrated in cc's or ml's with equal results.
- 1 milliliter = 1 cubic centimeter