Commercial Diesel
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Joined: Nov 2009
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From: Orange County, NY
Commercial Diesel
Took a trip this past week in my 85 F-350 6.9L DSL. Along the way I needed to stop and fill up. This is something that has happened to me a couple times already and I am beginning to find it very annoying. So I stopped at a Diesel truck station which had good fuel prices and went to fill up. When I pulled out the pump handle I immediately realized that the nozzle wasn't going to fit my truck. It was the larger commerical nozzle. So I hung it up and went inside to ask which pump would fit my truck. Guess what... they didn't have one. They had regular gas pumps but no diesel. So i continued on my way until I found an overpriced station that met my fuel nozzle needs. This is not the first time this has happened. One day I hit about 5 stations that didn't carry diesel, and then one that had 3 pumps for commercial trucks... thankfully they had 1, yes only 1 pump for cars/rv's. Has anybody done a fill tube conversion on there truck so it is able to accept the larger commercial nozzle?
Dan
Dan
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From: Virginia
I did mine. I took the clamp off and the 3 bolts, and took the filler assembly out of the side of the bed. Next thing I did was yank and pull till I got the smaller rubber hose out of the middle of the larger hose. I then put the metal filler in a vise, and took a hammer and sharp chisel and worked around the inside of the filler, cutting away the hole sort of like a old time can opener.
The large nozzles now fit ok, but you can't open them up wide open. I don't know about you, but my diesel and most other Ford diesels have the filling problem, and even the smaller pump nozzles give me trouble. What I am going to do next is take the vent fitting out of the top of the tank, screw a 1/2" 90 degree pipe fitting into the rubber grommet, and run a larger vent pipe off that and hook it to another 90 degree fitting that I am going to weld into the metal filler pipe near the top. That should help the air get out of the tank better, and stop the slow filling.
The large nozzles now fit ok, but you can't open them up wide open. I don't know about you, but my diesel and most other Ford diesels have the filling problem, and even the smaller pump nozzles give me trouble. What I am going to do next is take the vent fitting out of the top of the tank, screw a 1/2" 90 degree pipe fitting into the rubber grommet, and run a larger vent pipe off that and hook it to another 90 degree fitting that I am going to weld into the metal filler pipe near the top. That should help the air get out of the tank better, and stop the slow filling.
Thread Starter
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Junior User
Joined: Nov 2009
Posts: 88
Likes: 1
From: Orange County, NY
I did mine. I took the clamp off and the 3 bolts, and took the filler assembly out of the side of the bed. Next thing I did was yank and pull till I got the smaller rubber hose out of the middle of the larger hose. I then put the metal filler in a vise, and took a hammer and sharp chisel and worked around the inside of the filler, cutting away the hole sort of like a old time can opener.
The large nozzles now fit ok, but you can't open them up wide open. I don't know about you, but my diesel and most other Ford diesels have the filling problem, and even the smaller pump nozzles give me trouble. What I am going to do next is take the vent fitting out of the top of the tank, screw a 1/2" 90 degree pipe fitting into the rubber grommet, and run a larger vent pipe off that and hook it to another 90 degree fitting that I am going to weld into the metal filler pipe near the top. That should help the air get out of the tank better, and stop the slow filling.
The large nozzles now fit ok, but you can't open them up wide open. I don't know about you, but my diesel and most other Ford diesels have the filling problem, and even the smaller pump nozzles give me trouble. What I am going to do next is take the vent fitting out of the top of the tank, screw a 1/2" 90 degree pipe fitting into the rubber grommet, and run a larger vent pipe off that and hook it to another 90 degree fitting that I am going to weld into the metal filler pipe near the top. That should help the air get out of the tank better, and stop the slow filling.
DG
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Joined: Apr 2008
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I have the harpooned tanks on my truck, I fill up at big truck pumps more often than I do at car diesel pump, I can tell you that 1/2" vent from top of tanks ain't large enough to run the pump at full bore, actually even car diesel pumps shut off rather quick if I run them wide open. I think it ain't so much as the vent is too small, as it's the darn fuel foams up too much cause it has to run down a long hose, and not straight into the tank like it does with a big truck... Regardless, make sure your vent hose is at least 5/8" ID, 3/4" would be even better, I'm redoing mine in 3/4" when I get around to dropping the rear tank for replacement.
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From: Virginia
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What I am going to do next is take the vent fitting out of the top of the tank, screw a 1/2" 90 degree pipe fitting into the rubber grommet, and run a larger vent pipe off that and hook it to another 90 degree fitting that I am going to weld into the metal filler pipe near the top. That should help the air get out of the tank better, and stop the slow filling.
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From: Virginia
It worked out well. No, I cannot run the nozzles full flow with the 1/2" vents, but it's so much better than the stock system. If I use a big truck nozzle, I have to regulate it by hand, but it's filling plenty fast for me. I can put the filler on the 1st automatic notch on the smaller car type pumps. I am very happy with it.
I am not sure how you would get a fitting and pipe bigger than 1/2" on the rear tank. I had some copper pipe with sweat 90's on it laying around, so I used that, the OD of the sweat 1/2" 90 just fit into the rubber grommet, and I used a little bit of permatex 1 sealer around for insurance against leaks. When I lowered the bed back down on the frame, the vent pipe was trapped between the top of the tank and the bottom of the bed, with no room left for anything bigger.
Most people modify the metal filler neck with a fitting to install the vent line, but I just got a length of hose, and wire tied it in a large loop going up into the cavity behind the bedside, and then attached a little bit of window screen on the end of the hose to keep bugs out of the pipe.
I am not sure how you would get a fitting and pipe bigger than 1/2" on the rear tank. I had some copper pipe with sweat 90's on it laying around, so I used that, the OD of the sweat 1/2" 90 just fit into the rubber grommet, and I used a little bit of permatex 1 sealer around for insurance against leaks. When I lowered the bed back down on the frame, the vent pipe was trapped between the top of the tank and the bottom of the bed, with no room left for anything bigger.
Most people modify the metal filler neck with a fitting to install the vent line, but I just got a length of hose, and wire tied it in a large loop going up into the cavity behind the bedside, and then attached a little bit of window screen on the end of the hose to keep bugs out of the pipe.
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Now that I have my bed off I have been thinking more about this. I am thinking I will do exactly what Dave did with the half inch 90 into the rollover valve opening, but I am also considering drilling another hole for a second half inch vent.
I know there must be some clever way to solve this so I am going to post up and see if someone a little brighter than me has any better ideas than adding a second vent.
I also want to eliminate the filler vent hose, and chisel out the filler neck to take a semi nozzle.
What if I tapped in a 3/4 inch vent at the base of the fill hose where it goes into the tank, would that help? I have seen some pretty elaborate fuel vapor plumbing setups but I want to keep it simple if possible.
I spent 45 minutes in 5 degree temps with 60 mph winds a few weeks ago trying to fill this thing up and I thought I was going to die! So I am now determined to solve this once and for all.
I know there must be some clever way to solve this so I am going to post up and see if someone a little brighter than me has any better ideas than adding a second vent.
I also want to eliminate the filler vent hose, and chisel out the filler neck to take a semi nozzle.
What if I tapped in a 3/4 inch vent at the base of the fill hose where it goes into the tank, would that help? I have seen some pretty elaborate fuel vapor plumbing setups but I want to keep it simple if possible.
I spent 45 minutes in 5 degree temps with 60 mph winds a few weeks ago trying to fill this thing up and I thought I was going to die! So I am now determined to solve this once and for all.
