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#1 |
Registered User
Join Date: Jul 2016
Location: West Kelowna, BC, Canada
Posts: 204
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Fuel Filler question 1966 C10
I have built my idea of a fuel filler setup for my 66 C10. I am not very experienced with fuel systems so I was wondering if others know if it is important to add a fuel overfill/vent connected into the filler neck close to the filler cap, OR if it is enough to run a fuel vent line that is not connected to the filler neck using hose and a rollover valve. (Fuel filler is positioned on the INNER wall of the Fleetside bedside) Any ideas would be appreciated. Pictures for reference....
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#2 |
Senior Member
![]() Join Date: Nov 2013
Location: Portland, OR
Posts: 529
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Re: Fuel Filler question 1966 C10
I just installed my fuel filler in a similar spot on my GMC. I don’t have a vented cap so I installed the rollover vent about 3-4 inches above the fuel cap. I still get a little bit of fuel pushing out of the vent after I fill up and the truck sits-I assume the fuel is expanding with heat and pushing up the vent line. If you have a vented cap, I suggest you route the vent line to the filler neck to avoid my situation.
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#3 |
Registered User
Join Date: Oct 2014
Location: Brandon, Manitoba, Canada
Posts: 970
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Re: Fuel Filler question 1966 C10
I have my vent/rollover valve mounted up high between the inner and outer fender and a non-vented boat filler cap to fill. My routing is similar to yours and I have to fill slowly or it gurgles back on me. Nothing burping out the vent.
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#4 | |
Registered User
Join Date: Jul 2016
Location: West Kelowna, BC, Canada
Posts: 204
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Re: Fuel Filler question 1966 C10
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#5 |
Registered User
Join Date: Jul 2016
Location: West Kelowna, BC, Canada
Posts: 204
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Re: Fuel Filler question 1966 C10
Great spot for easy access! Slower fill is not so bad if you can sit on the tailgate.
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#6 |
Registered User
Join Date: Dec 2019
Location: Greer Sc
Posts: 248
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Re: Fuel Filler question 1966 C10
Filled mine today at the gas station, it overflows quickly with the inline filter No Limit sent with the tank. So had to fill super slow.
But when I took that filter off it vented ok, 1/4" hose for vent tube. Going to move up to 5/16 line when I do my bed fuel door and get the same filter you show. That line size should take care of venting pretty good for you. I am going to run the vent line up in the stake pocket hole. Should be high enough and hopefully be able to fill with full handle pull.
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1964 C10 Resto-mod 5.3L - L59 |
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#7 | |
Registered User
Join Date: Jul 2016
Location: West Kelowna, BC, Canada
Posts: 204
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Re: Fuel Filler question 1966 C10
Quote:
This is a rough mock up of what I have done except I have made a bracket (to be welded soon) to hold the filter separately. So, 5/8 return line connected to a bung that is welded high on the filler neck. 5/16 line from the rollerover vent to the small air filter. |
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#8 |
Registered User
Join Date: Dec 2019
Location: Greer Sc
Posts: 248
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Re: Fuel Filler question 1966 C10
Looks good, received my fuel box this week and will be starting it next weekend.
Went with the curved version, hopefully its close to the bedside curve when mounted. But mainly fills easily with less overflow and is easier to insert nozzle vs my behind brake light setup.
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1964 C10 Resto-mod 5.3L - L59 |
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#9 |
Registered User
Join Date: Dec 2019
Location: Greer Sc
Posts: 248
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Re: Fuel Filler question 1966 C10
Got mine finished today, does not look the best but it works for sure.
You should have no issue with the larger vent line. I have the 1/4" still and eas able to lock the nozzle with fastest fill and it never overflowed. Well when it was full it did but the nozzle clicked off on its own. Only lost a few tbs on ground. 7 gallons in maybe a minute or so, very happy with it.
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1964 C10 Resto-mod 5.3L - L59 |
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#10 | |
Registered User
Join Date: Oct 2018
Location: B.C. Canada
Posts: 206
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Re: Fuel Filler question 1966 C10
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#11 | |
Registered User
Join Date: Feb 2013
Location: central California
Posts: 2,736
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Re: Fuel Filler question 1966 C10
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#12 |
Registered User
Join Date: Dec 2019
Location: Greer Sc
Posts: 248
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Re: Fuel Filler question 1966 C10
If you break the cheap magnetic latch in the box like I did you can get them from amazon very cheap. Can get a 2 pk for $5, swapped mine out today.
Also home depot carrys them, but only found it in brown there.
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1964 C10 Resto-mod 5.3L - L59 |
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#13 |
Registered User
Join Date: Jul 2016
Location: West Kelowna, BC, Canada
Posts: 204
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Re: Fuel Filler question 1966 C10
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#14 |
Registered User
Join Date: Jul 2016
Location: West Kelowna, BC, Canada
Posts: 204
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Re: Fuel Filler question 1966 C10
So, here's the filler and venting layout. Vent line from the tank's rollover vent (with air filter on it), Overfill/venting line near filler neck, and of course the filler neck. All squeezed between the inner and outer bedside walls (the filler door is on the inner bedside wall).
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