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Old 04-08-18, 09:24
Robhowie Robhowie is offline
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Default Diesel fuel system t4 2.5

Hi. Does anyone have full system diagram they can post. Trying to fault find hard starting. Tested all glowplugs etc too and cleaned tank feed. Runs OK once started and filter changed
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Old 04-08-18, 09:32
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hybrid800 hybrid800 is offline
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Default Re: Diesel fuel system t4 2.5

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Originally Posted by Robhowie View Post
Hi. Does anyone have full system diagram they can post. Trying to fault find hard starting. Tested all glowplugs etc too and cleaned tank feed. Runs OK once started and filter changed
what filter type is fitted?

theres a common issue with the 'thermo-valve' on the return line (from injectors to filter to tank)

these are a plastic 'tee' that fits into the filter.

common to crack & let air into the system - almost a 'service' item

https://www.ebay.co.uk/itm/VW-T4-TRA...kAAOxyAs9SOtU7

link for example, possibly cheaper items available


Rich.
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Old 04-08-18, 21:07
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Rake Rake is offline
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Default Re: Diesel fuel system t4 2.5

Hi Rob,

Quick check - have a look at the clear plastic view pipe on the fuel pump while someone cranks the engine.

If there is air in the fuel you will see bubbles in the pipe.

If not then the issue lies elsewhere
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Old 06-08-18, 09:35
hobbyhorse hobbyhorse is offline
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Default Re: Diesel fuel system t4 2.5

Hard starting....

Have you checked the timing ?

Ouch.... another knuckle
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