Gas pouring from the tank fill !! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevycraft · 01-14-2020, 11:24 AM

Okay... I know I could relocate my tank ....but I won`t ... Has anyone found a way to stop the tank from pouring out gas when making a right turn or going on a exit !!

engineer_gregh · 01-14-2020, 12:01 PM

Mine have never done that. Is the seal on your gas cap bad?

rpmerf · 01-14-2020, 01:16 PM

I forget what year they changed it. I know my 70 has a vented cap. I'm not sure if it was 71 or 72 they made the change to a sealed cap and a vent inside the truck on the passenger's C pillar (or is it a B pillar). With a vented cap, I don't know there is a good way to stop it. I've tried 3 different caps, same result. It only happens when my tank is full. If I keep it at ~3/4 of a tank, it has been fine.

Astro-Balls · 01-14-2020, 01:48 PM

If you have a spill problem you might try one of these fuel flaps..

https://www.pciinc.com/shop-pci/150-...FLAP-p61376480

toolboxchev · 01-14-2020, 02:46 PM

Couple of things happen.

1. They probably overfilled you at the station. I have had them do that on purpose. Tank most likely holds 2 or more gallons after first click on the fuel pump shut off.

2. Think I had a vented cap in the past, got the correct one and changed the gasket to a thicker one from ACE hardware, and no more issues.

Willys_MB · 01-14-2020, 02:54 PM

I haven't had this problem, but I recently switched to a vented cap because I read on this forum to do that to help with fuel/oil issues. My fuel pump died and fuel got into the block. Everyone on the forum said to switch to a vented fuel cap and put a new fuel pump on and it should work. Now I'm second guessing my decision to go to a vented cap...

**Steeveedee** · 01-14-2020, 10:49 PM

Quote:

Originally Posted by Willys_MB

I haven't had this problem, but I recently switched to a vented cap because I read on this forum to do that to help with fuel/oil issues. My fuel pump died and fuel got into the block. Everyone on the forum said to switch to a vented fuel cap and put a new fuel pump on and it should work. Now I'm second guessing my decision to go to a vented cap...

If you have a '68 truck as shown in your sig, a vented cap is required, since it doesn't have a vapor recovery system. I switched over to a non-locking cap because the locking caps' gaskets go bad so quickly. Mine is a '70 with no vapor recovery system. If you don't have fuel leaking out on right turns, you're fine.

toolboxchev · 01-15-2020, 11:42 AM

Quote:

Originally Posted by Steeveedee

If you have a '68 truck as shown in your sig, a vented cap is required, since it doesn't have a vapor recovery system. I switched over to a non-locking cap because the locking caps' gaskets go bad so quickly. Mine is a '70 with no vapor recovery system. If you don't have fuel leaking out on right turns, you're fine.

X2 on those locking gaskets caps, they are poop!

68panelman · 01-14-2020, 03:12 PM

My 67 did this on the ride home when i purchased it. Replaced fuel cap with new and problem solved, it had the original cap with a dried up gasket

custom10nut · 01-14-2020, 09:30 PM

I used to have the problem until I bought a quality cap.
Stant is the one I use, but as precaution, I don’t put more that 18 gallons in the tank, unless I’m making a road trip on the Interstate

Astro-Balls · 01-15-2020, 11:22 PM

What vented cap is best, that looks original?

**Steeveedee** · 01-16-2020, 01:06 AM

Mine is chrome plated. That looks good. I don't think that any other finish was offered for a cap that was outside. If you had a locking flap cover like the saddle tanks on my truck have, the cap could be galvanized with two ear flaps. That's what I have on the saddle tanks. You could use that for your main tank, but they are pretty ugly.

Willys_MB · 01-16-2020, 01:18 AM

Quote:

Originally Posted by Astro-Balls

What vented cap is best, that looks original?

I bought a stant because I’ve always had good luck with them. I’m sure other members have their opinions. $10 shipped on rock auto

toolboxchev · 01-16-2020, 12:25 PM

Quote:

Originally Posted by Astro-Balls

What vented cap is best, that looks original?

I got a chrome plated one from Napa, Stant, I presume. The gasket it comes with only lasts about 6 months, take it off and go over to ACE hardware. There you should be able to find a thicker more durable gasket that fits like a glove. Makes the gas cap tight, but not too difficult.

Let me know if you need some help with that, I could go over to the local store and get a whole bunch of them and spread them around!

Willys_MB · 01-16-2020, 12:34 PM

Quote:

Originally Posted by toolboxchev

I got a chrome plated one from Napa, Stant, I presume. The gasket it comes with only lasts about 6 months, take it off and go over to ACE hardware. There you should be able to find a thicker more durable gasket that fits like a glove. Makes the gas cap tight, but not too difficult.

That's good to know... mine's only been on for a couple weeks. I'll have to head to ACE soon!

morepwr · 01-16-2020, 02:16 PM

Mine did that and a new gas cap fixed it. I also learned that the rubber grommet thru the cab isn't great so it would run back in the cab creating a nice "essence de unleaded" in the cab.

volksworld · 01-16-2020, 06:25 PM

a vented cap isnt just a cap with a hole in it...it is sealed but has a one way valve to allow air into the tank to replace the fuel that is used up...your problem isnt that the cap is vented, your problem is that you bought a cap that is a piece of crap

lil hoodlum · 01-16-2020, 07:38 PM

I also have a Stant cap. Top my tank off every 10 days as my truck is a daily driver. 1968 C10 with the gas tank in the cab.

Andy4639 · 01-18-2020, 10:27 PM

I cut rubber gasket material for a added gasket thickness works every time. I have done it several times.

01-14-2020, 11:24 AM	#1
chevycraft Registered User Join Date: Feb 2018 Location: Northport ny Posts: 39	Gas pouring from the tank fill !! Okay... I know I could relocate my tank ....but I won`t ... Has anyone found a way to stop the tank from pouring out gas when making a right turn or going on a exit !!

01-14-2020, 12:01 PM	#2
engineer_gregh Registered User Join Date: Feb 2012 Location: Smyrna TN Posts: 1,153	Re: Gas pouring from the tank fill !! Mine have never done that. Is the seal on your gas cap bad? __________________ 1971 Longbed BB Cheyenne Super 1972 Longbed SB Cheyenne Super 1972 Longbed Highlander Custom Deluxe 1975 K5 4x4 full convertible Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=645165 Greg Smyrna TN

01-14-2020, 01:16 PM	#3
rpmerf Registered User Join Date: Feb 2011 Location: Parkville, MD Posts: 1,024	Re: Gas pouring from the tank fill !! I forget what year they changed it. I know my 70 has a vented cap. I'm not sure if it was 71 or 72 they made the change to a sealed cap and a vent inside the truck on the passenger's C pillar (or is it a B pillar). With a vented cap, I don't know there is a good way to stop it. I've tried 3 different caps, same result. It only happens when my tank is full. If I keep it at ~3/4 of a tank, it has been fine. __________________ 1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z

01-14-2020, 01:48 PM	#4
Astro-Balls Registered User Join Date: Feb 2019 Location: Nor Cal Posts: 822	Re: Gas pouring from the tank fill !! If you have a spill problem you might try one of these fuel flaps.. https://www.pciinc.com/shop-pci/150-...FLAP-p61376480 __________________ 1968 C20 Fleetside 396 4sp PS PB AC CST . https://www.youtube.com/watch?v=RWK8GgWD4uA

01-14-2020, 02:46 PM	#5
toolboxchev Registered User Join Date: Jul 2015 Location: 2nd left past the stump on a dirt road. Posts: 2,629	Re: Gas pouring from the tank fill !! Couple of things happen. 1. They probably overfilled you at the station. I have had them do that on purpose. Tank most likely holds 2 or more gallons after first click on the fuel pump shut off. 2. Think I had a vented cap in the past, got the correct one and changed the gasket to a thicker one from ACE hardware, and no more issues.

01-14-2020, 02:54 PM	#6
Willys_MB Registered User Join Date: Apr 2017 Location: Boise, ID Posts: 856	Re: Gas pouring from the tank fill !! I haven't had this problem, but I recently switched to a vented cap because I read on this forum to do that to help with fuel/oil issues. My fuel pump died and fuel got into the block. Everyone on the forum said to switch to a vented fuel cap and put a new fuel pump on and it should work. Now I'm second guessing my decision to go to a vented cap... __________________ 1968 GMC C2500 Long Bed Fleetside

01-14-2020, 03:12 PM	#9
68panelman Registered User Join Date: Jan 2011 Location: Delaware and Long Island, New York Posts: 3,456	Re: Gas pouring from the tank fill !! My 67 did this on the ride home when i purchased it. Replaced fuel cap with new and problem solved, it had the original cap with a dried up gasket

01-14-2020, 09:30 PM	#10
custom10nut Registered User Join Date: Apr 2015 Location: East Tn (In the heart of the Smoky Mtns) Posts: 1,882	Re: Gas pouring from the tank fill !! I used to have the problem until I bought a quality cap. Stant is the one I use, but as precaution, I don’t put more that 18 gallons in the tank, unless I’m making a road trip on the Interstate

01-15-2020, 11:22 PM	#11
Astro-Balls Registered User Join Date: Feb 2019 Location: Nor Cal Posts: 822	Re: Gas pouring from the tank fill !! What vented cap is best, that looks original? __________________ 1968 C20 Fleetside 396 4sp PS PB AC CST . https://www.youtube.com/watch?v=RWK8GgWD4uA

01-16-2020, 01:06 AM	#12
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,608	Re: Gas pouring from the tank fill !! Mine is chrome plated. That looks good. I don't think that any other finish was offered for a cap that was outside. If you had a locking flap cover like the saddle tanks on my truck have, the cap could be galvanized with two ear flaps. That's what I have on the saddle tanks. You could use that for your main tank, but they are pretty ugly. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

01-16-2020, 02:16 PM	#16
morepwr Registered User Join Date: Jun 2018 Location: Ventura, Ca Posts: 206	Re: Gas pouring from the tank fill !! Mine did that and a new gas cap fixed it. I also learned that the rubber grommet thru the cab isn't great so it would run back in the cab creating a nice "essence de unleaded" in the cab. __________________

01-16-2020, 06:25 PM	#17
volksworld Registered User Join Date: Apr 2011 Location: formerly NY currentlyNC Posts: 390	Re: Gas pouring from the tank fill !! a vented cap isnt just a cap with a hole in it...it is sealed but has a one way valve to allow air into the tank to replace the fuel that is used up...your problem isnt that the cap is vented, your problem is that you bought a cap that is a piece of crap __________________ 1970 short step c10 leaf spring 454

01-16-2020, 07:38 PM	#18
lil hoodlum Registered User Join Date: Oct 2009 Location: Denton, Texas Posts: 1,729	Re: Gas pouring from the tank fill !! I also have a Stant cap. Top my tank off every 10 days as my truck is a daily driver. 1968 C10 with the gas tank in the cab.

01-18-2020, 10:27 PM	#19
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Gas pouring from the tank fill !! I cut rubber gasket material for a added gasket thickness works every time. I have done it several times. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.



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