914 6 Fuel System

CHAPTER EIGHT

FUEL SYSTEM -914/6

A single Hardi electric fuel pump delivers fuel from the fuel tank to 2 triple-throat Weber carburetors. See Figure 1. This system is nearly identical to that used on the late 1966-1969 Porsche 9L 1's.

AIR CLEANER

All 914/6 models use a disposable type paper cartridge. Replacement is described in Chapter Two.

Removal/Installation

This procedure describes removal/installation of the entire air cleaner housing.

1. Disconnect preheater hose from air cleaner. See Figure 2.
2. Disconnect crankcase breather hose from back of air cleaner. See Figure 3. Clean flame arrestor as described in Chapter Two.
3. Unsnap 4 clips at each carburetor and lift air cleaner off.
4. Remove nuts securing air cleaner bases to carburetors. Lift bases off.
5. Installation is the reverse of these steps. Ensure that gaskets are in good condition.

WEBER CARBURETORS

Removal/Installation

1. Disconnect condensation hose from air cleaner. See Figure 4.
2. Unsnap air cleaner cover and remove air cleaner element.
3. Unsnap air cleaner ducts from top of carburetors.

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4. Disconnect fuel lines from carburetors.
5. Disconnect throttle linkage from carburetors.

See Figure 5.

6. Remove the retaining nuts and lift the carburetor(s) off.

CAUTION

Do not let lockwashers or other loose parts fall into intake manifolds.

7. Cover intake manifolds (see Figure 6) to prevent entry of dirt and loose parts.
8. Installation is the reverse of these steps. Clean carburetor base and manifold surfaces and use new gaskets. Adjust idle speed.

Disassembly

Each Weber carburetor consists of 3 nearly identical throats. To aid reassembly, keep parts from the 3 throats in 3 separate containers. Keep parts common to all throats in a fourth container.

Refer to Figure 7 for the following procedure.

WEBER CARBURETOR

Table Caption: This table lists parts with their corresponding numbers. The parts appear to be components of a mechanical system, possibly an engine or a carburetor, given terms like "needle valve," "throttle shaft," and "jets."

1. Remove 10 nuts securing top of carburetor and lift top off. See Figure 8.

2. Remove hollow bolts securing fuel line top of carburetor. See Figure 9. to

3. Remove needle valve plugs and float needle valves. See Figure 10.

4. '4. Remove main jet carrier. See Figure 11. IJnscrew main jet from back of each jet carrier. See Figure 12.

5. ldle speed adjustment screw 3. Air adiusting screw

6. Main iet canier

7. ldle mixture screw

8. Remove air adjustment lock nuts and screws. See Figure I 1.

9. Remove idle metering jets. See Figure 11.

10. Remove idle speed adjustment screw. See Figure 11.

11. Remove idle mixture screws. See Figure 11.

12. Remove air correction jets and shake out emulsion tubes.

13. Remove check valves and accelerator pump nozzles. See Figure 13.

14. Remove preatomizers; if stuck, tap very lightly to loosen. See Figure 13.

15. Loosen venturi setscrews and remove venturis.

16. Unscrew float pins (see Figure 14) and lift out floats.

17. Remove nuts securing accelerator pump cover and remove cover.

18. Remove accelerator pump, outer diaphragm, spring, pump body, inner diaphragm, valve, and spring.

Cleaning

1. Clean all parts in solvent.
2. Clean jets and drillings in the carburetor body with compressed air. Do not clean them with pins or pieces of wire; you might enlarge the holes.

Inspection / Reassembly

Refer to Figure 7 for the following procedure.

NOTE: Use all new parts included in a standard Porsche rebuild kit; asterisks identify these parts on Figure 7.

1. Check throttle shaft for wear.
2. Hold carburetor up to light and close throttle. No light should be visible around any of the