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Large MPVs -- Ford Galaxy / VW Sharan / SEAT Alhambra: => Mk3 Ford Galaxy / Ford S-Max => Topic started by: geedle on January 03, 2019, 05:14:27 PM

Title: Low Fuel Rail Pressure and leaking fuel line
Post by: geedle on January 03, 2019, 05:14:27 PM
Hi,

the low pressure line on my MK3 galaxy (TDCI 143) had a couple of leaks - one was a poor bodge by the previous owner.  It involved cable ties, inner tube and some kind of glue.  I've repaired all of the leaks and there are now no longer any bubbles in the clear site hoses.

I thought that they were the cause of it loosing power under load, but now it continues.  Forscan shows errors for low fuel rail pressure and if you watch the fuel rail pressure, it droppes to about 4000 KPa when it looses power.  It jumps up suddenly and the car regains full power.

Any pointers or tests I can do from here?  How to I diagnose a fuel pressure regulator vs a high pressure fuel pump?  My concern is that all the air damaged the high presssure fuel pump.

Thanks, Geedle.
Title: Re: Low Fuel Rail Pressure and leaking fuel line
Post by: johnnyroper on January 03, 2019, 07:16:36 PM
Itís a difficult one as without specialist equipment it is a bit of trial and error.
If it was me I would replace the pressure sensor as itís easiest and cheapest and see how it performs. Of fault remains then you are looking at hP pump
Title: Re: Low Fuel Rail Pressure and leaking fuel line
Post by: geedle on January 06, 2019, 11:21:42 AM
So on these the pressure sensor and the pump are one unit, though can be separated. I got the whole assembly from the scrap yard from a Focus of a similar vintage. The numbers stamped in the castings were different and one of the inward fuel line connection was different to clear the cowling on the galaxy.

It took 10 mins to remove from the focus and about 2 hours to squeeze into the galaxy. Bled down using the return line and started in an impressive cloud of smoke. It's like a whole new car. Less smoke and more power. I reckon it had been on the way out for a while. £40 well spent!

Cheers, Geedle