Tank vent problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*red70* · 07-13-2012, 05:59 PM

Guys i installed a blazer poly tank under bed and hooked a marine filler up to it. I also drilled and tapped for a vent fitting on on the filler neck and have it hooked up to the tank but i still cant pump gas for more than 2 or 3 seconds whars going on wiyh this thing help!

Bryce
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*red70* · 07-13-2012, 11:21 PM

Ttt anyone?
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haysonj · 07-13-2012, 11:35 PM

Quote:

Originally Posted by red70

Ttt anyone?
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I don't have a poly tank but on my steel tank I had to run a seperate vent and put a check valve on it so water could not enter the tank. I also have the one in the neck.

PanelDeland · 07-14-2012, 09:17 AM

You need a vent from the sending unit.Ron a hose(even just coiled on top of the tank)with a check valve as suggested.

*red70* · 07-14-2012, 10:18 AM

What would the check valve do guys? It seems like yhe other side of the tank would be vented because theres a port just no hose on it. It just seems like there is too much air in the tank and it cant escape. I put an 1/8 in fitti g for a vent on the filler neck and hooked it up to the tank
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lowrollin70gmc · 07-14-2012, 02:11 PM

I put a 1/2 inch vent line in the custom tank I built for my K20 and it vents great. I have it to the corner opposite my fill point and connects to the filler neck (stock burb neck). 1/8 seems pretty small as you have a lot of liquid volume going in pushing air out quickly.

*red70* · 07-14-2012, 02:50 PM

Its got 3/8 fuel hose connected to it
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*red70* · 07-14-2012, 02:51 PM

Any other suggestions fellas?
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PanelDeland · 07-14-2012, 02:54 PM

The vent lets air out as fuel goes in.The check valve keeps water from getting in when fuel is pulled from the tank.The other "slow fill" problem I have run into is if the filler hose/tube etc. is kinked or reduced in some way or maybe turns too sharp.

*red70* · 07-14-2012, 08:33 PM

Where can i get a check valve
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dbstepside · 07-15-2012, 08:02 AM

on my stepside i ended up having to run a vent way up in the driver's side fender to be able to give it gas. i have the poly tank. i also have the check valve on mine as well. until i ran the vent up there i had to put gas in real slow with the click, click, click method. good luck.

haysonj · 07-15-2012, 10:13 AM

Quote:

Originally Posted by red70

Where can i get a check valve
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I got mine at a transmission shop. Since I have a 4x4 I also put one on the two differantels and the transmission

dbstepside · 07-17-2012, 08:06 AM

mine is the end you can get a motorcycle shop. it's the vent cap for the vent line off a four wheeler instead of running the long tube down. before that i had the check valve off of a rearend.

07-13-2012, 05:59 PM	#1
red70 Account Suspended Join Date: Sep 2006 Location: Kingston, TN Posts: 178	Tank vent problems Guys i installed a blazer poly tank under bed and hooked a marine filler up to it. I also drilled and tapped for a vent fitting on on the filler neck and have it hooked up to the tank but i still cant pump gas for more than 2 or 3 seconds whars going on wiyh this thing help! Bryce Posted via Mobile Device

07-13-2012, 11:21 PM	#2
red70 Account Suspended Join Date: Sep 2006 Location: Kingston, TN Posts: 178	Re: Tank vent problems Ttt anyone? Posted via Mobile Device

07-14-2012, 09:17 AM	#4
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	Re: Tank vent problems You need a vent from the sending unit.Ron a hose(even just coiled on top of the tank)with a check valve as suggested. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

07-14-2012, 10:18 AM	#5
red70 Account Suspended Join Date: Sep 2006 Location: Kingston, TN Posts: 178	Re: Tank vent problems What would the check valve do guys? It seems like yhe other side of the tank would be vented because theres a port just no hose on it. It just seems like there is too much air in the tank and it cant escape. I put an 1/8 in fitti g for a vent on the filler neck and hooked it up to the tank Posted via Mobile Device

07-14-2012, 02:11 PM	#6
lowrollin70gmc Too many projects Join Date: Mar 2004 Location: Fargo, ND land of the flat hills Posts: 1,147	Re: Tank vent problems I put a 1/2 inch vent line in the custom tank I built for my K20 and it vents great. I have it to the corner opposite my fill point and connects to the filler neck (stock burb neck). 1/8 seems pretty small as you have a lot of liquid volume going in pushing air out quickly. __________________ Andrew 84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck" 70 GMC C1500 LWB My first truck: shaved, bagged, and more: the lowrollin70gmc 68 K20 Suburban 12V Cummins/NV5600/NP205/D60/11.5AAM 3.73s "Dakota Cadillac" 63 Chevy II Nova Coupe 250 I6/T56/4.56s "Economy car" 53 Willys Wagon 350/NV4500/BW4401/HP D44/9inch “Winter Wagon” 30 Model A 16 Focus ST

07-14-2012, 02:50 PM	#7
red70 Account Suspended Join Date: Sep 2006 Location: Kingston, TN Posts: 178	Re: Tank vent problems Its got 3/8 fuel hose connected to it Posted via Mobile Device

07-14-2012, 02:51 PM	#8
red70 Account Suspended Join Date: Sep 2006 Location: Kingston, TN Posts: 178	Re: Tank vent problems Any other suggestions fellas? Posted via Mobile Device

07-14-2012, 02:54 PM	#9
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	Re: Tank vent problems The vent lets air out as fuel goes in.The check valve keeps water from getting in when fuel is pulled from the tank.The other "slow fill" problem I have run into is if the filler hose/tube etc. is kinked or reduced in some way or maybe turns too sharp. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

07-14-2012, 08:33 PM	#10
red70 Account Suspended Join Date: Sep 2006 Location: Kingston, TN Posts: 178	Re: Tank vent problems Where can i get a check valve Posted via Mobile Device

07-15-2012, 08:02 AM	#11
dbstepside Registered User Join Date: Dec 2010 Location: murray ky Posts: 351	Re: Tank vent problems on my stepside i ended up having to run a vent way up in the driver's side fender to be able to give it gas. i have the poly tank. i also have the check valve on mine as well. until i ran the vent up there i had to put gas in real slow with the click, click, click method. good luck.

07-17-2012, 08:06 AM	#13
dbstepside Registered User Join Date: Dec 2010 Location: murray ky Posts: 351	Re: Tank vent problems mine is the end you can get a motorcycle shop. it's the vent cap for the vent line off a four wheeler instead of running the long tube down. before that i had the check valve off of a rearend.



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