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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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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-TRANSPORTER-VAN-CAMPER-CADDY-VAN-FUEL-FILTER-BLEED-VALVE-191127247A-C565/190906667672?epid=1227473541&hash=item2c72ec9298:g:dtkAAOxyAs9SOtU7

link for example, possibly cheaper items available:*


Rich.
 

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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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