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Thursday, November 11, 2010

WS4 Fuel Pressure and flow (Petrol only)

We located the fire extinguishers.

There was no leaks with the fuel pressure gauge plugged in.

The pressure with key on engine off was 0psi this is not right i don't think this gauge was very accurate.

Idling pressure 40psi.

Clamped return line 70PSI

WOT=50PSI.

Residual 41pSI.

It is important to check because if the fuel pressure is to high or low the car will be effected
negatively. it is only important to check if your car is having problems or you require more petrol by increasing the pressure.

Low fuel pressure means the car will run lean because there is less fuel being sprayed in the time the injectors are open.

Low fuel flow means the car will run lean from lack of petrol being pumped. This could be from a faulty pump.

High fuel pressure means the car will run rich because there is more fuel being sprayed in the time the injector is opened.

If the fuel pressure regulator was faulty this could mean rich or lean. If its seized open fuel pressure will be low and if its closed all the time pressure will be high.

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