I have an 87 Turbo T and when I try to start it it just cranks for ten to twenty seconds before it starts. I turn the key and let the fuel pumps prime up but it doesn't get any fuel pressure. When it eventually does start the pressure reads fine. I have a brand new Walbro fuel pump, the fuel filter is new, and I just replaced the fuel pump relay. Any suggestions as to what it could be? I had a fuel issue earlier this year and it's why I changed the pump. The adjustable regulator was swapped out in the process with a non adjustable but they were swapped back after it was discovered to not be the cause of that problem. Any help would be greatly appreciated. Thanks.