• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

TR2/3/3A gas leak on a TR3

Jerry

Luke Skywalker
Gold
Country flag
Offline
I filled up our TR3A, perhaps a little too much gas. I was following my wife on our way to a car show and the TR3 was leaking gas out of the overflow tube on the gas tank. Has anyone tried just pluging that tupe up?
 

PeterK

Yoda
Offline
I think if you plug up the overflow, then it would overflow out the cap on to your rear deck, boot, rear seat area.
 

Banjo

Yoda
Country flag
Offline
Yup. that's also a vent. if you plug it up, it may create a vacuume situation eventually causing a fuel dilivery problem. likewise the vapors need a place to expand. Like Peter said, thay have to go somewhere, like all over your rear deck, or interior, or push fuel past the float needles and cause flooding.
Modern cars have the charcoal canister at the end of that vent hose. (And if you overfill them, all that fuel saturates the charcoal and renders it usless)
In short, don't plug it. Just be a bit more reserved about filling up.
 

donbmw

Jedi Warrior
Silver
Country flag
Offline
The original tank that was in my 59 TR3 had a baffle that would not let gas come out. When I replaced the tank with a new one it would come out the vent when turning left and when starting out. There was a thread that talked about this and that the fuel cap could be vent. My replacement cap has a small hole for venting. I did block the overflow on the tank and have not had any problems doing this. This has been over two years ago.

Don
 

TR3driver

Great Pumpkin - R.I.P
Offline
Plugged mine many years ago; never had a problem since.

No baffle that I found on any of my original tanks ... a baffle wouldn't help anyway since the 'overflow' is open all the time and the fuel would simply rise on the overflow side of the baffle until it ran out the overflow.

In my case there were two incidents that led me to plug it; first was having a gas station attendant (remember those ?) repeatedly 'top up' the tank while standing in a spreading pool of gasoline running all over the ground. Second was looking at the ground where I made a hard left turn, and finding a trail of evaporating gasoline ... doesn't take much of a turn to force fuel out the overflow with a full tank !

The cap has a vent hole in it (at least all the TR2-3A ones I've looked at do), and since it is much higher, the filler neck can act as an expansion chamber. Of course, it is possible to overfill until the expanding fuel runs out over the trunk lid; but in some 30 years I never had that problem.
 
Similar threads
Thread starter Title Forum Replies Date
P TR6 Tr6 stromberg carb gas leak from starter valve bolt shaft Triumph 5
M TR6 TR6 Gas Leak From Front Carb Triumph 5
I Solution for gas leak? Spridgets 1
D Gas Tank Leak Spridgets 8
C Gas Leak? Austin Healey 12
I TR6 TR6 gas line leak - please help Triumph 15
S Pesky Gas Leak Triumph 2
zimmy gas leak : [ Spridgets 6
Baz Gas leak everywhere Spridgets 8
T TR4/4A Gas tank leak on TR4 Triumph 5
R Gas tank leak Spridgets 10
B Damaged threads in the gas tank Austin Healey 7
BierRunner TR6 TR6 Gas Pedal Triumph 2
Jim_Stevens Off Topic Ethanol-free gas link Triumph 1
J TR2/3/3A TR3 gas tank mystery Triumph 5
Rob Glasgow New Gas Tank Austin Healey 8
T For Sale TR2 - TR3 Gas Cap for sale Triumph Classifieds 1
B TR4/4A Gas Tank color? Triumph 4
B BE vs. Later Model Gas tanks Spridgets 2
B How to clean the old gunk out of a Spridget gas tank? Spridgets 21
JPSmit Fuel line - gas tank question Restoration & Tools 5
Ripper01 SOLD-TR6 Gas Tank Triumph Classifieds 3
A Wanted Gas tank for TR6 Triumph Classifieds 5
J For Sale Triumph Tr 2/3 Gas Pedal Triumph Classifieds 0
T TR6 My '74 TR6 Zenith Stromberg Carbs Float Bowls Leaking Gas Triumph 11
D What's inside the gas tank?? Spridgets 13
C TR2/3/3A Gas Line Triumph 11
A TR2/3/3A Interior rear panel covering gas tank and rear seat bottom install. Triumph 7
S TR2/3/3A TR3 gas filler cap Triumph 1
J TR2/3/3A TR3A gas tank repair Triumph 4
longbridgehealey Fuel pump racing, no gas Austin Healey 26
Rut MGB Running out of gas symptoms MG 21
T TR2/3/3A TR3A Gas Cap Triumph 15
D Gas Pedal Pad Jaguar 7
K For Sale TR3 Gas Cap Assembly Triumph Classifieds 0
T magnets and gas tanks, and other applications Austin Healey 3
Michael Oritt Gas cap parts now in tank Austin Healey 17
Rhodyspit75 Bonnet gas struts Spridgets 0
K TR2/3/3A Gas Gauge sending unit "float" orientation? Triumph 5
K TR2/3/3A Gas tanks...two different types? Triumph 5
ckeithjordan TR2/3/3A Gas Filler Cap Triumph 1
R TR2/3/3A Installing gas tank Triumph 6
N Gas tanks???? Spridgets 9
FlyingCat Spitfire No Gas to Carburetor Triumph 15
S TR2/3/3A glass rattled on the gas gauge Triumph 3
FlyingCat Spitfire Gas tank Triumph 2
L General TR Ethanol free gas Triumph 34
T vented gas caps? Spridgets 8
S TR2/3/3A how to install a gas tank in an early tr3 Triumph 8
D TR6 1976 TR6 Gas smell in Trunk Triumph 9

Similar threads

Top