Mustang EFI conversion
Finally taking the plunge into EFI. As usual, nothing is easy. I’m using a special EFI fuel tank made by Tanks, Inc. with an in-tank electric pump. Nice, but a couple of glitches. Part of the internal baffles interferes with the fuel gauge.
I managed to bend it out of the way enough that I think the gauge will work. Also this tank is based on the 22 gal. ’70 fuel tank, so a different filler neck is required. The installed and partially wired fuel tank is pictured below. The fuel lines run to bulkhead fittings to pass through the trunk floor behind the axle.
I’m using 3/8″ stainless steel tubing for most of the lines, stainless braided lines in some areas, and “twist-lok” in others. Left rear wheel-well below:
Under drivers side
Left front wheel well
I had trouble getting the 1/4 NPT fittings at the fuel-pump mounting plate to seal until I used Teflon tape. I was able to take it for a test drive (and to buy gas) Sunday June 12th. The difference is unbelievable, even though it hasn’t had time to completely tune itself. During this process, I discovered that the old Crane chrome coil was leaking oil, which likely explains the misfires under hard acceleration (at the drag strip). I replaced it with a MSD coil from Summit Racing. I also discovered that the rear seal on the Tremec transmission was leaking, so I replaced that seal. Transmission oil was leaking onto the exhaust system, and all over the under-side of the car, probably for a year or more.
I can hear the fuel pump running, although it was much less noticeable after nearly filling the tank. I left the fuel-tank vent plugged for now. Finding a place to route a vent such that it vents outside instead of inside the trunk space seems like a challenge. Maybe I can put it high up in the wheel-well?
6/18/16: After about 60 miles of driving it mostly runs far smoother and much more responsive than ever before; however, I’m having some crank-startup issues, and it has died on me twice. I’ll post my settings when I find a combination that works.
