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Matt110



Member Since: 29 Jun 2014
Location: UK
Posts: 680
United Kingdom 
Air in the fuel pump when first keying on...
TD5 90, 66k on the clock.

No issues before I changed the fuel filter.

Changed filter, and whenever you turn the key to position 2 and the fuel pump primes, it gurgles and sounds like the system is full of air, which subsequently runs round the fuel lines (you can hear it circulate round the engine bay, return to the tank) and then after a priming operation or 2, clears, goes quiet, and no issues.

Turn off and restart in less than 30 minutes.... No air. Restart the following morning. Lots of air.

I've replaced this thing.



And I've also done the fuel priming operation several times with throttle 5 X apply on key on.

Anyone know what to try next?
Post #889435 6th Mar 2021 1:50pm
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5695
2006 Defender 110 Td5 USW Zermatt Silver
I would check around fuel filter head for moisture incase it has become porous, if not swap fuel filter for a very very high quality one incase yours is faulty or not sealed properly. The next step would be swap the fuel injector seals. Main dealer parts only.
Post #889439 6th Mar 2021 2:16pm
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rallysteve



Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2227
United Kingdom 2002 Defender 110 Td5 DCPU Keswick Green
Did the rubber seal come off with the old filter or stay stuck on the filter head? 02' 110 TD5 Double Cab Rebuild Thread
Post #889441 6th Mar 2021 2:31pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8021
 2011 Defender 110 Puma 2.4 USW Stornoway Grey
Does it start normally? Ie without priming on cold start Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #889451 6th Mar 2021 3:30pm
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Matt110



Member Since: 29 Jun 2014
Location: UK
Posts: 680
United Kingdom 
Thanks all.

Answers to the thoughts...

The filter head is bone dry and was working fine before I changed the filter.

Rubber seal came off with the old filter and new one was on the new filter.

Haven't really wanted to try cranking it till the air has passed round and got itself out each cold start in case it knackers the HP pump with insufficient diesel to lubricate it. But starts instantly once the air has circulated round and the pumps gone quiet. What's the thinking in each case? Does start/doesn't start?
Post #889456 6th Mar 2021 3:59pm
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rallysteve



Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2227
United Kingdom 2002 Defender 110 Td5 DCPU Keswick Green
How much have you driven it since doing the filter? I find mine gurgles for a few days after changing.

Also there is no HP pump to worry about it, the TD5 has camshaft driven unit injectors. I find that even the extra fuel return pipe on the 15P head doesn't get rid of all the air in the fuel rail so takes a while for it to move through.

Steve 02' 110 TD5 Double Cab Rebuild Thread
Post #889472 6th Mar 2021 5:12pm
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