1975 F100 with the aft mounted gas tank. Gas cap is on the outside of bed. Not the style with the gas filler door. It seems it takes forever to put any gas in it because if you pump too fast it runs back out. I put new filler and vent hoses on it but it didn't help matters any. Has anyone got any solutions for this or is it something I have to live with? Thanks. Kenny

 

I would like to hear the solution as well... always spills down the side.

 

Do you have those rubber boots on the fuel pump where you live? They make it nearly impossible.... Have to hold the boot back with one hand and it's awful.
I always had good luck filling my other truck with that style filler cap by just barely sticking the fuel pump in and leaving it out the first hold open click. New pumps are faster than old pumps so you probably can't expect it to go full speed like on a new truck with a vented tank.

If you change the fuel tank you can always buy a vented one and install the valve on top.

 

i had this issue with mine when i first got it, i didnt replace anything but here's what i found worked for my 75 f100 longbed with cap on drivers side outside. This also solved the issue with the gas nozzle constantly clicking off too. You'll notice when you insert the long nozzle (insert joke here..mughaha) that it goes in and then at a weird angle and then all the way to the hilt. I push the nozzle all the way in until it hits the rubber hand guard that are on most pumps and then i back it out about 2-3"(don't pull out to far..haha) It took me about 2-3 tries and i haven't had either one of those problems since. In fact, i can set the nozzle full speed with the metal down locker and walk away and it will even click off when finished. I would have NEVER attempted that before i learned this little trick. All "sex references aside" i hope this trick helps you guys. Cant stick it in too far or pull it out too far. I checked my hoses and they were in great shape so i didn't replace mine.

 

I'll hafta try that. Filling these tanks has been a real exercise in patience...

 

No rubber on the nozzle. Just have to turn the nozzle in the up position a little. Still have to pump so slow or it will run out on the side of the bed. I might look at running a new filler opening into the bed somewhere.

 

Yes, that's for sure. Bigfoot listed the other truck that helps. If the nozzle doesn't have a rubber hand guard its one of the fast fill pumps, so the same trick as I mentiond before but lift up as you pump gas, you just cant leave it alone because when it's finished and it clicks it sprays a bit of gas back at you.

 

I found the easiest way imo. Get a piece of fuel hose that is a tight fit in the fill neck I think 1 1/4. If I remember correctly. About 1 1/2 foot long. Push it in half way. And put the gas nozzle in and fill it up at full flow. Just be careful the auto shut off won't work on the gas delivery nozzle and when you are full you will know in a hurry. It took me a little practice to get it down but in the long run it was worth it no spilling fuel no fighting the nozzle clicking off

 

Going to try some of these tips! Such a headache trying to fill the tank.

 

I turn the nozzle upside down and fill at half-speed.

 

Look to see if you have a metal band around the fuel filler hose as it goes over the top of the frame. If it doesn't the hose is crimping and not allowing full flow. Also check if the bleed hose is unobstructed.

 

Your truck has a small vent hose and a large fill hose correct?


The most common issue with fuel filler necks is that the vent hose is lower than the fill hose. The vent hose are usually taped to the side of the fill hose. What happens is over the years the vent hose drops lower than the fill hose.


You end up losing the vent and have a hard time filling the tank. I have experienced this on my old 78 as well as hundreds of new trucks that were modified thru my previous employer that needed to come back and get fixed because the installed didn't put the vent higher than the fill.

 

Stylesides: 1973/76 have exposed fuel caps, 1977/79 have fuel doors.

People complained to dealers that the mid-ship & aft axle tanks have been "slow fill" since day one and there's nothing that can be done about it...due to the curvature of the fuel filler necks.

 

my fix is cutting the side panel from a 77-79 and cutting the same size panel out of my truck bed and welding the panel from the 77-79 and useing the fuel door... but for the time being i just turn it to the side and fill full speed

 

Yeah it's a headache. Before I replaced both hoses(fill & vent) it was leaking a little fuel out of the vent hose. I couldn't figure that one out. Why would I have fuel leaking from the vent hose that is on top of the fill hose. So I replaced both. I ran a small diameter plastic air line through the vent tube and it stops right before it goes into the tank. I don't know if there is some kind of safety device that won't let it go all the way in or not? I may have a tank problem I don't know. Thanks everyone for the feedback.