The Car - Focus '09 plate 1.7 TDCI Zetec 115, >30k miles.
Have scanned the last few months postings for anything similar and would appreciate any suggestions.
The Symptoms -
After cruising for say 1 hour on the motorway at approx 2k revs for economy I take the exit and slowly reduce speed up to the lights at the top of the slip road and stop - the engine dies and won't restart. The first time this happened I managed to get over the lights before it quit and park on the side. I called the RAC and the guy arrived after 45 mins and plugged in his diagnostic laptop. The fault he found was low fuel pressure. This would increase as you turned the engine over, it would fire, the pressure would drop and it would die. After trying various things he removed the low pressure fuel line while i turned it over and it started. He suggested the fuel sensor but it was giving readings. No further problem for the remainder of the journey, performance perfectly normal.
On the return journey and after stopping without any problem at services on the way I took the slip road for my exit and again it died at the lights. I tried removing the low pressure fuel connection but it did not start. After about 15 mins of waiting and cranking it restarted, again no further problem for that journey.
I decided to try going down through the gears on the exit slip road on a recent motorway trip of over an hour in case it was some kind of tick-over failure. ON the way out no problems but on the way back it did it again in exactly the same conditions. This time it restarted after just 3-4 tries and I was off home.
The car had a 25k service last June but the documentation does not indicate what was done to the fuel filter if anything.
Is there a fuel return valve that lets excess fuel back into the tank that could be sticking - what does it look like?
I really like this car, it handles well and has all the poke I need but this fault is not good if a symptom of a deeper problem especially if the bad weather is heading our way.
Any ideas gratefully received.
AlanSalopMember Since 10 Jan 2013
Offline Last Active Jan 13 2013 04:32 PM
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Focus TDCI Zetec
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16 Jan 2013 - 08:23