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Replacing Fuel Tank on 1979 F150 custom


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byeargin1
New User

Oct 11, 2012, 11:28 AM

Post #1 of 8 (4188 views)
Replacing Fuel Tank on 1979 F150 custom Sign In

I pulled the old fuel tank out and it has the EMS hole in the top center of the tank.
I am looking to get a polypropylene replacement but it does not have the EMS Hole in the top.
I reside in Florida therefore am replacing the tank due to rust, and would like the "plastic" new tank so I would not have to worry about that problem again.
Also I do not want to replace the entire EMS System--can I just use a tank without the EMS or will that cause issues?

Thanks in advance!!


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Oct 11, 2012, 12:07 PM

Post #2 of 8 (4168 views)
Re: Replacing Fuel Tank on 1979 F150 custom Sign In

EMS?





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byeargin1
New User

Oct 11, 2012, 12:19 PM

Post #3 of 8 (4158 views)
Re: Replacing Fuel Tank on 1979 F150 custom Sign In

My understanding is that it is the venting to follow emissions laws in certain states. A tube comes out of the EMS hole in the top center of the fuel tank and vents to a charcoal filter.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Oct 11, 2012, 12:44 PM

Post #4 of 8 (4147 views)
Re: Replacing Fuel Tank on 1979 F150 custom Sign In

Just put a regular metal one exact as the one you are replacing in. If it lasted since 1979 it owes you nothing. There are virtually NO 1979 anythings still seen on the roads of the rust belt areas unless purposely not used and stored away for Winters if you live where they salt roads which is most, not all allow it.

That vent if plugged off means you would need to rethink how the tank is vented at all or would collapse or make a vacuum such that it wouldn't deliver fuel. Not just trucks but about everything by 1979 vented thru canister. Before that the gas cap was the vent and said so on them.

Consider the hidden thinking of reducing chance of sparks as gas tanks and filler necks have to or everything would explode. Last check tanks were not that expensive but you may have to cut the straps, remove old tank to work on or replace straps and fasteners without the gas tank there. If you wish, paint up the new one but you shouldn't have to,

T



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Oct 11, 2012, 12:48 PM

Post #5 of 8 (4144 views)
Re: Replacing Fuel Tank on 1979 F150 custom Sign In

I believe if you do delete the vapor recovery system, you'll have to be sure and install a vented fuel cap.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Oct 12, 2012, 4:45 AM

Post #6 of 8 (4096 views)
Re: Replacing Fuel Tank on 1979 F150 custom Sign In

Takes some thought and right one. Both vented and anti surge should work. Reason for anti-surge is so it wont splash gas out when full tank on turns it can. Restored a 1969 vehicle and previous owner spent ages getting tank to quit making odor when full parked in a garage or turning just right and tank was out for inspection many times by others before I got it and was just the wrong cap! This should work with or without the canister but default to vent ouside at a lower pressure than would cause a vacuum problem in tank,



Should look a lot like that for this without using the canister and still AYOR,

T

(This post was edited by Tom Greenleaf on Oct 12, 2012, 4:54 AM)


byeargin1
New User

Oct 12, 2012, 7:00 AM

Post #7 of 8 (4081 views)
Re: Replacing Fuel Tank on 1979 F150 custom Sign In

Thanks for the advice all. It does have a vent tube that comes up next to the filler tube. Not sure if this makes a difference?

I guess my only issue is--I am not sure if I want to visit making the entire EMS system correct--replacing all that tubing/lining/charcoal filter if I don't need to.
If the tank is already vented next to the filler tube should that be enough?


Tom Greenleaf
Ultimate Carjunky / Moderator
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Oct 12, 2012, 7:39 AM

Post #8 of 8 (4070 views)
Re: Replacing Fuel Tank on 1979 F150 custom Sign In

I plain can't recall the exact tank and filler neck on this. Know that as you put gas in the air on top of tank needs to go to at least the filler neck or would take forever to try to fill it. That has nothing to do with capturing raw fuel vapor thru canister by itself and must work or fuel can blast back out at you while filling it up.

The evap thru canister idea was an emission control that didn't harm anything or hurt performance. It just let vapor get caught in that charcoal canister and upon start up would use it not just vented to atmosphere. Only service near always ignored was to blow out a fiberglass type screen on the bottom of those early ones -- I think beginning with 1968 give or take. It made sense never mind emissions as garages would stink of fuel with just the expansion and contraction of fuel and fuel vapor going into a closed garage.

The 100% vented fuel filler caps that tanks were such that the cap was at the tip top of the tanks about like a gas can you would fill. It shouldn't be the world or expensive to just make it all work as intended with a lot less chance of fuel vapor or worse leaking out fuel neck which they did when overfilled. If those were in a tight garage just flip on a light switch and we wouldn't be discussing this with many folks!

None of this is high end trickery to make this a pest for you to just make as designed. Any rubber hose involved should be replaced just because of the age of it and make sure to only use hose rated as fuel tolerant. All the stuff I see is marked right on the hose itself for fuel and PCV which means it won't collapse in a vacuum either.

Just do it OE and be happy. Manufacturers made enough mistakes back when and earlier but TMK most were safe by the late 70s,

T







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