Gary Lewis Posted August 23, 2019 Share Posted August 23, 2019 It may be for when you are removing it so it can't be blown out by pressure. My front tank would actually dribble fuel in hot weather unless I used it first, the exhaust heat, even with the extra 35" between the exhaust and tank would expand the fuel enough to force it out the cap. The original evaporative system plumbing was a 3/16" line, the 1990 system used a 3/8" line to the dual canisters. Yes, E7UZ 9030-B is for 80/86 F250/350 - - 8 cyl, 460. (Notice that the MPC implies there was a 460 in years when there wasn't one.) And I suspect Bill's right - the heat does cause the front tank to build up pressure. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 23, 2019 Share Posted August 23, 2019 Yes, E7UZ 9030-B is for 80/86 F250/350 - - 8 cyl, 460. (Notice that the MPC implies there was a 460 in years when there wasn't one.) And I suspect Bill's right - the heat does cause the front tank to build up pressure. And the U is for Bronco? 460's had no Cats, and therefore no 'unleaded fuel only' warning. Maybe the filler neck is larger to accommodate the bigger nozzle? (Ack! I'm dating myself again, aren't I?) Link to comment Share on other sites More sharing options...
Gary Lewis Posted August 23, 2019 Share Posted August 23, 2019 And the U is for Bronco? 460's had no Cats, and therefore no 'unleaded fuel only' warning. Maybe the filler neck is larger to accommodate the bigger nozzle? (Ack! I'm dating myself again, aren't I?) Yes, the "U" is for the Bronco. Dunno about the neck. Don't see anything specific to the 460, but maybe I'm missing something? Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 23, 2019 Share Posted August 23, 2019 Yes, the "U" is for the Bronco. Dunno about the neck. Don't see anything specific to the 460, but maybe I'm missing something? I didn't realize Bronco's came with the 460. I thought the 460, 6.9 and H.O. were only found in 250-350 trucks. And that 150's/U got the 300, 302 & 351. I guess I was very wrong. Link to comment Share on other sites More sharing options...
kramttocs Posted August 23, 2019 Share Posted August 23, 2019 Yes, the "U" is for the Bronco. Dunno about the neck. Don't see anything specific to the 460, but maybe I'm missing something? Even with the 'U' it will fit the 86 F250 right? Asking because I needed new ones as my gaskets were crumbling so I ordered some last night but cancel still if needed. I'd briefly mentioned about the 'flapper' on some necks in the filler neck thread but thinking about it, the 3 86 460 trucks I've looked at had large mouths (not the main opening but the one a little further in) and none of them have that flapper. The other trucks (didn't pay attention to the motor but I know they weren't 460's) has the flapper and I think smaller mouths. The size of the vent was mentioned above and you can see in the ebay photo the large cream colored part in the center of the cap underneath. The other caps I've looked at are all metal there except for something like a 1/8 hole. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 23, 2019 Share Posted August 23, 2019 Even with the 'U' it will fit the 86 F250 right? Asking because I needed new ones as my gaskets were crumbling so I ordered some last night but cancel still if needed. I'd briefly mentioned about the 'flapper' on some necks in the filler neck thread but thinking about it, the 3 86 460 trucks I've looked at had large mouths (not the main opening but the one a little further in) and none of them have that flapper. The other trucks (didn't pay attention to the motor but I know they weren't 460's) has the flapper and I think smaller mouths. The size of the vent was mentioned above and you can see in the ebay photo the large cream colored part in the center of the cap underneath. The other caps I've looked at are all metal there except for something like a 1/8 hole. U means it was originally designed for the Bronco. I remember those little restrictor plates in the filler necks very well. I used to pump gas 10-7 overnight, then get to high school by the 7:20 bell. Link to comment Share on other sites More sharing options...
kramttocs Posted September 5, 2019 Share Posted September 5, 2019 U means it was originally designed for the Bronco. I remember those little restrictor plates in the filler necks very well. I used to pump gas 10-7 overnight, then get to high school by the 7:20 bell. Just to followup, they fit the filler necks for my 86 460 fine although the whole 2 step twist process will get old really fast. Link to comment Share on other sites More sharing options...
Gary Lewis Posted September 5, 2019 Share Posted September 5, 2019 Just to followup, they fit the filler necks for my 86 460 fine although the whole 2 step twist process will get old really fast. Interesting! I'd heard about that cap, but don't guess I've ever seen one. Maybe I don't care to? Link to comment Share on other sites More sharing options...
kramttocs Posted September 5, 2019 Share Posted September 5, 2019 Interesting! I'd heard about that cap, but don't guess I've ever seen one. Maybe I don't care to? I'd stick with the E4. Good thing the 460 hardly ever needs filled up Link to comment Share on other sites More sharing options...
Gary Lewis Posted September 5, 2019 Share Posted September 5, 2019 I'd stick with the E4. Good thing the 460 hardly ever needs filled up Mine hasn't had gas added to it in a month, and probably won't for the next six months. Link to comment Share on other sites More sharing options...
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