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Warning: Fuel injection system faulty - Things to try.
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Author:  Saffles [ Mon Oct 24, 2011 12:09 am ]
Post subject:  Warning: Fuel injection system faulty - Things to try.
This can be quite a common spoken message on Phase 2 Safranes and when you hear it alarm bells can be heard, you panic, breathing becomes irratic and you start thinking about expensive repair costs. Fear not because despite all the Safrane electronic wizardry, it's normally something pretty simple which you can fix yourself saving you a lot of money hiring a mechanic to investigate / guess and fix it.

It often occurs when trying to start the car. When you turn the key to the contact position (the one before the starter position) it will prime the injector rail and engine. If you hit the starter position straight away before the pressure rail is up to pressure and primed this can cause the system to detect a ignition / low fuel pressure problem causing the car to speak.

The injector rail must be at a pre-determined pressure for starting and running the engine. You'll notice that if you leave it a few seconds before hitting the starter position you'll hear the injectors rattling in the engine bay. When they stop you can hit the starter position and you won't hear the warning. The message can also be spoken when driving.

Here are some things to try to clear this error:
  • Check the fuel lines to the engine are not leaking. Start the engine and look inside the engine bay at the fuel lines where they are connected to the back of the engine on the drivers side at the top. They can often become frail, cracked and leak slightly affecting fuel pressure. If they are you can generally cut 1cm off and reattach it. Too much and you'll need the engine out to replace them. You must check these while the engine is running as petrol evaporates within seconds and therefore you will only see it leaking while the fuel is being pumped through the fuel lines.
  • Change the fuel filter. It's under the rear passenger door on the drivers side. On Safranes they're rarely changed and can clog up. Lack of fuel pressure to the injector rail can then subsequently register a fault with the onboard computer which then causes it to speak to you. You may not think this is important but it is. Fuel filters collect bits of dirt and grime from your petrol tank and catch it. This builds up over time and restricts the fuel flow which directly affects the fuel pressure.
  • Fuel pump - If the filter was clogged this may also be damaged or may just be knackered naturally due to its age.Warning: When removing the old pump you must put the big nut back on the tank straight away (with or without the replacement pump) because if you leave it off for longer than 15 minutes the petrol vapour will (apparently) result in the thread expanding permanently and you'll need a new petrol tank.

If the above doesn't solve it (and from a few owners that have had this problem, they have solved it with the above) then your next course of action is a trip to the dealers. Rates vary but my local dealer charges approximately £98 per hour + VAT.

Visit to the dealer:
  • Fault code reading at a dealer using CLIP
  • Fuel rail pressure check
  • ECU check
  • Injector cleaning or replacement assuming fuel pressure check was ok
Author:  Chris H [ Mon Mar 05, 2012 9:39 am ]
Post subject:  Re: Warning: Fuel injection system faulty - Things to try.
Ageing regulators and faulty drain back check valves are the usual cause for this.

Although often I find weeping fuel filters which cause the same issue.

Injectors can weep a bit which again drops rail pressure.

The schraeder valve on the end of the rail (pressure test port, has the blue valve cap on it) can also weep and often due to heat theres no evidence of a leak here.

But getting in ignition on put belt on then start the car as mentioned best fix for this.

Juts thought a bit of why it happens might be appreciated.
Author:  addsclayton [ Wed Aug 01, 2012 12:40 pm ]
Post subject:  Re: Warning: Fuel injection system faulty - Things to try.
I have had the Warning: Fuel injection system faulty coming up and after checking all lines, changing the fuel filter I still drew a blank. Turned out to be the 02 lamber sensor in the exhaust that was causing the issue.
Author:  Saffles [ Tue Mar 05, 2013 2:04 am ]
Post subject:  Re: Warning: Fuel injection system faulty - Things to try.
addsclayton wrote:
Turned out to be the 02 lamber sensor in the exhaust that was causing the issue.


:shocked: Well thats certainly an interesting cure!
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