My Haynes manual don't cover the 2 litre EFI sierra
But if it is the same as the 2 litre DOHC it'll be in the tank ............Very much, same as fitted to the Mudaneo & Escort Zetec engined cars
Can't remember if there is an access plate under the rear seat, so as you can lift out the pump & sender assembly !!
Dare say you can soon make one