i have a 1987 Volvo 740 turbo. the car wont start at all, it just cranks. now sometimes it will start and ill drive it, but when i go into the store or when i fill up gas, it won't start. i would wait couple of minutes then it will start again. but recently now it won't start up on my drive way. now i checked for spark and its good. so i checked my fuel pump, i can hear the outside pump buzzing but not the one inside the tank, so i replaced it and the car started to work again but after driving it and then letting it sit for an hour the car won't start again, just keeps cranking, i checked the fuel pumps again and both are making the buzzing sound, so i checked spark again and i still have spark because i sprayed some of the starting fluid and it fires up for a couple seconds. so now i don't know what to do. I'm completely baffled.