D2 Td5 POOR STARTING AFTER FUEL FILTER CHANGE

Did a fuel filter change on my Td5 D2 and after purging the air out it started fine. Next start was a little hesitant but ok, however since then if it hasn't been started for a couple of days it fires on cranking then cuts out, crank again and it will usually start but very 'lumpy' eventually idling at correct speed.
Today it took three tries of the starter to get it running, once it has run during the day it will start fine for the rest of the day.
It has done quite a few trips since the filter was changed so I'm finding it difficult to believe there is still air in the system but I'm not sure what the problem is. I've been told there is a one-way valve near the filter which should vent any excess air but there is obviously a problem – anybody got any ideas?

Thanks in advance

Did you seal the filter housing properly.

Col

Colthebrummie said:

Did you seal the filter housing properly.

Col

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That, or the housing itself ??

Colthebrummie said:

Did you seal the filter housing properly.

Col

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Thanks for your reply. Yes, as far as I am aware I sealed it ok with new rubber seal. Do you think it is air leaking in?

You may have a problem with the fuel pump!!???

Had that happen a couple of months ago?

Pump changed! All good now!

Kev

lrjohn said:

Thanks for your reply. Yes, as far as I am aware I sealed it ok with new rubber seal. Do you think it is air leaking in?

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Did the old seal come out?

Did you fill the filter with fuel before fitting it ? If not, that can put quite a bit of air into the loop....

If the air was completely purged from the fuel system, you have no leaks and the pump spinning sound on ignition is normal, then I would replace the filter just in case the one you have is defective. It's the cheapest and easiest option before you start taking things apart.

What I would do
Had it happen on my Terrano, always fitted genuine filters after that.

kermit_rr said:

Did the old seal come out?

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Yes, old one out and cleaned area

tilly2 said:

Did you fill the filter with fuel before fitting it ? If not, that can put quite a bit of air into the loop....

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Good point, believe i did but now i think about it not so sure

NPG said:

If the air was completely purged from the fuel system, you have no leaks and the pump spinning sound on ignition is normal, then I would replace the filter just in case the one you have is defective. It's the cheapest and easiest option before you start taking things apart.

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I think thats good advice and I have a spare so first thing to do. I've also been told that the one-way valve on the housing can jam open or get clogged and that allows air back in – anyone had that issue?

lrjohn said:

I think thats good advice and I have a spare so first thing to do. I've also been told that the one-way valve on the housing can jam open or get clogged and that allows air back in – anyone had that issue?

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There are many reports on this forum re. issues with the NRV and how to replace. Here's one -

https://www.landyzone.co.uk/land-rover/non-return-valve-replace.362397/

If a new filter does not help, that would be my next step. If it looks the worse for wear, I'd consider changing the entire housing which comes with everything fitted -

https://www.jgs4x4.co.uk/discovery-2-td5-fuel-filter-housing-with-filter-water-sensor-mahle/

Do that test just to rule out the pump https://www.landyzone.co.uk/land-rover/check-td5-fuel-pump-hp.358086/ some of them can work almost normal just on LP while the fuel loop is intact as there is a residual pressure in the system but once it was opened at the filter and the pressure drops to zero it will not work well anymore, worth a check

I changed the entire housing, fuel lines and fuel pump last year on my lads TD5 defender last year, as it was in such a poor condition. In the last month its now having starting issues. I took off the fuel temp sensor from the FPR, and stuck in a fuel pressure tester, and got the expected 4 bar on ignition. Still trying to sort out its starting issue as t turns over for about 20 seconds before firing up. My Disco is having the same issue, so watching this thread with anticipation..... Next step for us is replacing the FPR.

Is it summat to do with the weather getting colder? Glow plugs maybe.

Col

Colthebrummie said:

Is it summat to do with the weather getting colder? Glow plugs maybe.

Col

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Thas something I have been thinking, bought vehicle 3 months ago, warm weather and no starting problems. Fact that I changed the fuel filter may be coincidence, could be to do with glow plugs.

Coincidence is a nasty piece of work

Nope, just had new plugs. Anyway... not my thread.

tilly2 said:

Nope, just had new plugs. Anyway... not my thread.

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Tilly 2- just wanted to check your comment, are you saying you put in new glow plugs and you still got the poor starting issue??

This I have only had time to replace the fuel filter again in mine as suggested in one of the other replies to my thread and it hasn't made any difference, if anything it somewhat worse and I note the weather is got quite a bit cooler, again making me think glow plugs a possibility. However if you have replaced yours and of got exactly the same poor starting issues it does take me back to the fuel system and probably the filter housing