Dodgeb4ya Posted November 26, 2013 Report Share Posted November 26, 2013 (edited) There are three different seals for the gas tanks. Depends on serial # and year of production. I found this information in three Dodge parts books... 1948-49, 1948-50 and the master 1948-53. Shown is the early type seal. Bob Edited November 27, 2013 by Dodgeb4ya 1 Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted August 10, 2015 Report Share Posted August 10, 2015 (edited) The four small screw holes around the tank hole are used to screw down a block off plate on the big heavy trucks that use large external frame mount saddle tanks.. and don't use the under cab tank. Pic shown is of my 4 tonner with saddle tank The B3 trucks use just a piece of flat 1/8" rubber as a seal around the tank elbow up through the floor. Possibly B4 too. My B3 1 ton still has it. Edited August 11, 2015 by Dodgeb4ya 1 Quote Link to comment Share on other sites More sharing options...
JBNeal Posted August 8, 2018 Report Share Posted August 8, 2018 (edited) I took a break to test the frame on the 1-ton, just to see if those springs on the fuel tank moved as much as some folks think. So I oiled up the tractor jack and eased up the beast high enough on one frame rail to just pick the opposite side front tire off the ground. The bumper measured to be 25" at the driver frame rail and 22" at the passenger frame rail. The rear axle was firmly planted. I then measured the tank mounting springs as shown: I then lowered the truck carefully to the ground...by the 4th downstroke, the jack leaned over and sat the truck firmly on the ground a tire width south of where it had started...WEEEEE DOGGIES...this put the bumper about 16" above the ground. I then measured the tank springs again: After I took these measurements, I kinda wondered if the rear bolts were canting over as the frame rails were no longer on the same plane. But that angle is small enough that I do not have an accurate way to measure this movement. At any rate, the Dodge Truck engineers put these springs on here for a reason, so keeping them in place is a safe bet Edited December 12, 2020 by JBNeal photobucket pics lost 3 1 Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted August 8, 2018 Report Share Posted August 8, 2018 I'm a believer? Thanks for the exhaustive and dangerous testing! Quote Link to comment Share on other sites More sharing options...
48Dodger Posted August 8, 2018 Report Share Posted August 8, 2018 (edited) Put a load of bricks in it and park the left side in a pothole.....then measure....I bet its more dramatic. Like I say, its probably not as important now as back then....but its still a frame willing to flex under the right situation. 48D Edited August 8, 2018 by 48Dodger 1 Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted August 8, 2018 Report Share Posted August 8, 2018 Driving over bumpy ground or rough rail road tracks might show more tank spring action. Quote Link to comment Share on other sites More sharing options...
JBNeal Posted August 8, 2018 Report Share Posted August 8, 2018 (edited) Static testing is the only means at my disposal now, but thanks to GoPro, a camera and a fabricated displacement gauge could verify movement during dynamic testing... I dunno anybody willing to be strapped under one of these buggies while holding a ruler tho Edited August 8, 2018 by JBNeal added link Quote Link to comment Share on other sites More sharing options...
bkahler Posted December 11, 2020 Report Share Posted December 11, 2020 I would have loved to see those pictures. Any chance of reposting them?! Quote Link to comment Share on other sites More sharing options...
JBNeal Posted December 12, 2020 Report Share Posted December 12, 2020 (edited) fixed it...looking through my photobucket account, I can see quite a few pictures that aren't even in there anymore, with 4 of these pics among those missing...yet another disappointment from the photobucket that said that no pictures would ever be lost, no matter what additional information - gas tank spring details Edited February 8, 2021 by JBNeal added link 1 1 Quote Link to comment Share on other sites More sharing options...
JBNeal Posted September 18, 2021 Report Share Posted September 18, 2021 additional information - Fuel Tank Installation for Pilot-House Express and Chassis Cab Trucks Quote Link to comment Share on other sites More sharing options...
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