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Matt110

Member Since: 29 Jun 2014
Location: UK
Posts: 673

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?

6th Mar 2021 2:50pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5416

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.

6th Mar 2021 3:16pm

rallysteve

Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2196

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
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6th Mar 2021 3:31pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7682

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Does it start normally? Ie without priming on cold start Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

6th Mar 2021 4:30pm

Matt110

Member Since: 29 Jun 2014
Location: UK
Posts: 673

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?

6th Mar 2021 4:59pm

rallysteve

Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2196

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
84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale

Mobile Diesel Heater Build Thread

6th Mar 2021 6:12pm

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