How to fix Vauxhall combo blocked fuel line?

My Combo van will not start. Ran out of Diesel, put 5 gallons in yet still no start. AA came & added 5 more gallons but still no joy. Van stutters & almost starts then dies. Was wondering if its possible to clean fuel lines that exit tank as i'm beginning to think they're clogged up with all the sludge that must've been sucked up when i ran out of fuel.

Tried the foot on accelerator for 10 secs method but to no avail.

Ta