Porsche 924 Fuel Pump Pressure Switch

CHECKING CONTROL PRESSURE "COLD"

1. Connect and bleed pressure tester P 378, Set switching valve at position 2.

If the control pressure regulator is vacuum controlled, the charts will only show values for the vacuum test method.

Vacuum Pumps For Hygrogen

5, Produce specified vacuum with the hand vacuum pump, or adjust (see Testing and Adjusting Specifications),

1. Connect and bleed pressure tester P 378, Set switching valve at position 2.

Note

Engine must be cold for this test, which is absolutely essential for cars experiencing starting and/or warming-up problems. Do not use car for several hours, at best overnight.

If the control pressure regulator is vacuum controlled, the charts will only show values for the vacuum test method.

3. Pull wire plugs off of control pressure regulator to prevent overheating.

4. Bridge fuel pump relay socket terminals 30 and 87,

5, Produce specified vacuum with the hand vacuum pump, or adjust (see Testing and Adjusting Specifications),

2. Pull vacuum hose off of control pressure regulator and connect extra hose and hand vacuum pump US 8026 to connection of control pressure regulator.

6, Refer to diagram underneath Testing and Adjusting Specifications for nominal pressure agreeing with actual ambient temperature.

Handle Bar Warmer Wiring Diagram

CHECKING FUNCTION OF HOT START VALVE (CIS)

(to Reduce Control Pressure for Warm Start)

Test Requirement:

Engine warm, coolant temperature about + 60 °C/ 140 °F or warmer.

1. Connect pressure tester and switch to position 2.

2. Operate starter. This opens the hot start valve and drops the control pressure. Specification: 0.5 - 0.8 bar (note brief delayed action time).

928 Porsche Fuel Lines

3. If applicable, replace hot start valve or check temperature switch, i. e. temperature switch must have switched to through flow (ground).

Handle Bar Warmer Wiring Diagram

CHECKING HOT START VALVE FOR LEAKS (CIS)

1. Detach and plug fuel return line. 2. Bridge fuel pump relay.

3. Hot start valve must be absolutely tight, i. e. fuel must not escape on fuel return connection.

Porsche Classic Models

Porsche Classic Models

The History of Porsche Cars through its generational changes. A must have ebook for any Porsche fanatic, this ebook is a reference book for Porsche enthusiasts. Discover all there is to know about the greatest Porsches ever made. All models are fully described and illustrated providing a definitive production history plus an accurate guide to original specs and equipment.

Get My Free Ebook


Responses

  • esa
    How to replace fuel pressure regulator on 928 porsche?
    2 months ago

Post a comment