When i used a half inch ratchet i ended up craking it and it was doing the same as ur saying. A new cap and it runs fine. also make sure the oil filter is in right or it will let the oil out.
There is a second way how they heat the fuel to they bring the fuel back from the return lines and put it in the HFCM till it hits a sertin temp i forget what it is, Its in the bible i will have another look.