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I now have inside parking for my supercab. When I walk towards the rear, it reeks with fumes. No leaks or drips anywhere. Then I noticed if I remove the gas cap for a bit and let the pressure out and put it back on, the fumes quit for a while. The present cap is a Stant G751. Some NOS Ford caps show up on ebay well just about every week but I don't want to get the wrong one and parts stores often don't have a clue on these old trucks.
OH, my truck does nothave evaporative emission which I understand takes a different cap.
D4TZ-9030-A (replaced D3TZ-9030-A) .. Fuel Cap-Vented-Use without Evaporative Emission / Handle on top of cap / Primered finish (Motorcraft FC-98-A) / Obsolete
1973/76 F100/250 Stylesides with Mid-Ship and/or Aft Axle fuel tanks / 1973/74 F350's on the 140" wheelbase with Mid-Ship and/or Aft Axle fuel tanks.
1973/76 Stylesides have exposed fuel caps, use different fuel caps than 1977/79 Stylesides that have fuel doors (1977/79 example in post #17).
HAVEN FORD in Haven KS has 1 = 620-465-2252.
BARRY MOTOR CO. in Danbury IA has 1 = 712-883-2421.
GREEN SALES CO. in Cincinnati OH has 1 = 800-543-4959.
GRIESEL MOTOR CO. in Okarche OK has 1 = 405-263-7242.
NOS PARTS LTD in Waxahachie TX has 2 = 972-937-2201.
Thanks for clarification on the 77/79 with fuel doors needing a different gas cap
One thing that looks strange to me is the non evap gas caps seam to have a pair of legs that fit deeper into the fill tube. What is reason for these longer legs?
Thats strange as the two pics I gave are listed as vented caps used without EV/EM
D8TZ-9030-A: 7/78 F150/350 (99) - without ev/em; Motorcraft FC-807 - 2 5/8" O.D. - handle on top of cap - zinc plate finish - use w/aft axle and/or midship fuel tank
D7TZ-9030-K : 77 F150/350 - without ev/em: Motorcraft FC-791 - 3 1/2" O.D. - vented - knurled edge on cap - primer finish - use with in-cab fuel tank
Thats strange as the two pics I gave are listed as vented caps used without EV/EM
D8TZ-9030-A: 7/78 F150/350 (99) - without ev/em; Motorcraft FC-807 - 2 5/8" O.D. - handle on top of cap - zinc plate finish - use w/aft axle and/or midship fuel tank
D8TZ-9030-C replaced D7TZ-9030-K :77/78 F150/350 - without ev/em: Motorcraft FC-791 - 3 1/2" O.D. - vented - knurled edge on cap - primer finish - use with in-cab fuel tank
I run a parts store vented cap. It has a pressure relief valve which holds quite a bit of pressure or vacuum before it vents. Pressure means leaks or fumes and vacuum may cause vapor lock. I didn't care for that so I "fixed" it. A strategically placed 1/16" hole in the cap and no more problems.
I Just did the same exact thing to mine cuz alota tim es there is alota pressure built up in that tank. I don't think thats good for the carb or fuel pump.Not to mention the fuel tank.
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another members thread asking about fuel caps that have nothing to do with the OP's truck.
