Serious fuel pressure problems 2.0 2010 Antara - Vauxhall Antara Forums
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post #1 of 3 (permalink) Old 15th May 2019, 22:19 Thread Starter
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Serious fuel pressure problems 2.0 2010 Antara

Hi all,

Can anyone suggest why the tank fuel pump would fail to prime upon ignition and also produce a P0193 fault, that's a fuel pressure sensor circuit "high" fault. I've replaced the whole rail including the pressure regulator and sensor with a used rail off another antara and it will not clear the fault.

The vehicle is a 2.0 cdti 150bhp. I've also had the injectors done as there was 2 nozzles broken.

The fuel pump in the tank will not prime with the key on ignition, it will however run on an independant power supply from a battery. It will send fuel to the high pressure pump but no further.

I don't know whether to replace the fuel pump, high pressure pump or the fuel pressure sensor.

Anyone aware if a similar issue or suggest any further diagnosis to narrow down the problem, any help at all would be greatly appreciated.

Heleus91 is offline  
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post #2 of 3 (permalink) Old 18th May 2019, 21:08
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How does a mechanic diagnose the P0193 code?
The mechanic will start by inspecting the wiring and connectors for melted wires, broken wires, and corrosion. Repairing the wiring and connections if necessary.

They will use an OBD-II scanner to retrieve freeze frame data and trouble codes stored by the power control module.

They will complete a test drive, after clearing the codes, to see if the P0193 trouble code returns.

If the trouble code P0193 does not return immediately, this indicates the possibility of an intermittent issue. Intermittent problems may need to get worse before a proper diagnosis can be made.

If the car will not start, there is a possibility that there is no fuel in the fuel tank. Use a fuel pressure gauge to test the fuel pressure. Low fuel pressure is an indication that the car has little to no fuel.

To make sure the fuel pump is operating properly, the mechanic will listen to it. If the car won’t start, but they can still hear the fuel pump, the fuel injector circuitry could be faulty or a fuel filter could be clogged.

If the car won’t start and they cannot hear the fuel pump, they will try starting the car while another person taps on the bottom of the fuel tank. If the car starts, this means that the fuel pump needs to be replaced.

If the car does not start, they will check the battery voltage at the fuel pump connector. If there is no battery voltage at the fuel pump connector, they will check the fuse circuit, fuel pump relay circuit, and power control module circuit for any faults.

If these components are operational, inspect the fuel rail pressure sensor. Test the reference voltage of the fuel rail pressure sensor, using a digital volt ohmmeter, while the car is running. The voltage reading should be 5-volts. If this test is successful, test the ground wire.

If there is both a reference signal and ground signal, test the sensor resistance. If the sensor resistance test results do not meet the manufacturer’s specifications, the fuel rail pressure sensor will need to be replaced.

If the circuitry and sensors are working properly, there is a chance that the power control module is faulty. This is rare, but would require replacement and reprogramming.

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andriyresonate5 is offline  
post #3 of 3 (permalink) Old 5th September 2019, 13:39
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How did you get on with this fault? Having the same fault with a 2007, having replaced the tank pump with a 2nd hand unit, all was well for a month, then seemed to crack the fuel filter housing, up at the bulk-head, and was leaking a lot of diesel, so replaced that, and now will not start, showing fault code P0089, Rail Pessure- Too low pressure-intermittent, and also Fuel metering Solenoid Valve, Faulty, Intermittent, (on a Delphi diagnostic system).

I'm thinking of replacing the Fuel Pressure Regulator, at the back of the Injection pump, as you have replaced your fuel rail, therefore eliminating the High Pressure sensor? If you could post how or if you have sorted your problem, much appreciated.. its just so awkward to replace that valve..
Amon1 is offline  

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