I brought this up in a previous thread and received a few replies.I took the rear bumper off of my GA to replace the rubber strip with a better piece this past weekend.I thought now would be a great time to relocate the gas fill since I could easily get to the the stock fill tube.My plan is to go with a JAZ recessed gas cap assembly mounted on the top of the rear drivers side fender and routing a 2" stainless steel filler tube down along the inner fender well. Then exit the trunk with the 2"stainless tubing bent with a 90 across to the fill tube and then 90 into the tank.I will be shortening the old fill nozzel going to the tank by about 10".This would place the fuel fill tubing back away from the bumper by about 16-18".That should keep it away from the crumple zone. This car has a full frame so it will take a lot bang to crunch it that far.My gas tank has the old vent line to the charcoal canister so I don't think I will need two tubes for the tank to vent.But my concern is when filling the tank will the gas fill the extended tubing to the point that gas will flow to the old vent line that used to go to the charcoal canister or will the the gas nozzel sense a pressure build up and shut off like normal?Or should I reroute the vent line back along the new tubing and attach it to a fitting mounted on the bottom of the recessed gas cap assembly and thus venting outside of the trunk?
"If programmers were architects a single woodpecker could wreck civilization."
Fluid will seek its own level - no exceptions. So if the vent is below the highest level of the fluid (gas) the vent line will get some gas in it. The vent will need to be located above the highest level of the fuel.
I think the pump might do like normal on that setup, I don't see why it wouldn't. But I would be ultra cautious during the first fillup. I'm still trying to imagine the proposed setup. Joe, if you already did it hook us up with a pic and tell us how she went.
keeping the fuel tank on the other side of a solid body panel is the correct thing..if its under the car.. separated by the steel floor pan in the trunk..the problem lies that in relocating the filler.. you might be going thru the trunk area.. and that puts it closer to the cabin were passengers are seated..the issue with rear end collisions with police cars is the trunk is completely filled solid... this prevents the trunk area from being a crush zone and it moves it forward to the impact and crush the gas tank.. but also crushes the C pillar behind the rear doors into the B and A pillar effectively jamming the doors closed..brand F actually went as far on these interceptor models as installing automated fire extinguishers under the cars near the rear springs.. to smother any possible ignition source during the accident.. things as the cars stop moving are less sparky... hopefully...now.. if you decide to perform this...there is on cars with long filler necks a 5/8 tube that runs along side the filler neck.. this allows trapped air in the tank to rush up to the filler area to prevent the gurgles that will trip the gas nozzle each time.. some trucks have a fairly rigid plastic tube that connects the fuel flowing from the nozzle into the tank farther than the outer opening is.. so fuel goes in but does not block the vent side of the tube causing a burp... take a look at the various fuel filler nozzles available just for ideas...http://www.dormanproducts.com/gsearch.aspx?type=keyword&q=fuel%20filler%20neck&parttype=Fuel%20Tank%20Filler%20Neckif you have trouble filling the tank... you do have some possibilities..you might make a nozzle extension .. out of a gas cap.. and a part of a filler neck... so you can remove the cap.. and push/twist this into place... then fill away... there are some creative gas caps with trap doors.. so you just stick the nozzle thru the cap and pump away...creatively.. you could also.. do something like air shocks... or some air ride bags.. an air compressor out of a lincoln air ride car.. so you can boost the back of the car up for filling the gas tank...make it easy to reach...gates and goodyear also have various shapes of full filler hose... straights.. 45 degree bends.. 90 degree bends... in multiple sizes.. and a quick order thru most parts stores.. if you have the RIGHT part number to give them... describe what size you are needing.. i will put out some part numbers for you if you have trouble ...this is not radiator hose..
that link to dorman shows only the first 25. click the link at the bottom right of that page to switch to 100 view... then you only have one page to turn..there are thousands more designs..station wagons... vans of varous sizes and years...oh... and i skipped an important point..police cars that get rear ended hard enough.. are usually parked on the side of the freeways just outside of traffic lanes, many times parked at an angle to shield the officers from impacts.. so the rear reflectors don't work as well.. if you don't operate your car.. in situations that leave you by the side of the road late at night.. or sit for hours in stop and go traffic.. where the traffic will get up to full speed and come to a complete stop again and again... you have a better chance of ... i was going to say.. winning the lottery.. but just slightly less of a chance of getting hit by lightning. you could also.. cut open the top center of your fuel tank.. and install a panel like is used on fuel cells... some carefully crafted expanded metal or perforated metal in a removeable sort of package. so you can stuff your gas tank full of fuel cell foam.. and still have a working fuel sending unit.. actually there are vertical versions that can be retro fit.. no exposed swing arm..this could reduce the fire issue in rear impacts.. but is still safer under the back of the car.. separated by an intact trunk floor.. there is one possible other way to go.. and thats to put in a second connection on the front of your tank... so you come up behind and beside the differential... to go out thru the top of the rear fenders like on a dodge charger or jaguar.. this gets the filler neck away from the rear most impact zone.. see .. i have been thinking of crumple zones...