Vampires (1998) director John Carpenter was listed as Executive Producer in early publicity material for this film. However his name does not appear on the final credits, instead replaced by J.S. Cardone.
When Amanda is bitten in the alleyway you can see the end of the tube where the fake blood is pumped from and the line of blood from it as the Vampire pulls back, it is then visible again when he goes to take another bite.