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Gas cap leaking #4412317
05/23/17 01:44 PM
05/23/17 01:44 PM
Joined: Jan 2016
Posts: 716
Nebraska
Duffyjr Online content OP
Duffyjr  Online Content OP
Joined: Jan 2016
Posts: 716
Nebraska
Toro Super Recycler with Toro 159cc

This is my fourth season with this mower without any problems. Three weeks ago I was just about done mowing when I smelled gas. I looked down and gas is dripping out the cap, appears to be coming from in between the cap and spout. Dealer gave me new cap saying (with out looking at it) it must be the seal. Put new cap on and that seemed to fix the issue. Fast forward a few tanks of gas and same thing, just about done mowing when I smelled gas. You guessed it, cap is leaking. I decided to wait until I mowed again to see what happens so I mowed enough times to go thru the rest of that tank plus a full tank. It does leak less as the tank gets empty but still leaks. This is the weird part, it never starts leaking no matter how much gas is in the tank until I'm almost done mowing, about 20 minutes or so into mowing. I can about say, ok when I get here it's going to start leaking and sure enough it does.

If there was a crack in the spout wouldn't it leak all the time or at least any time gas splashed up that high? Or is it building up pressure from the cap not letting in air and finally gets to the point it pushes it out thru the cap? How about a heat issue since it only happens after it's been running for a while, is the tank getting hot and possibly opening up the crack?

Any thoughts?


89 GMC Sierra VWB 5w30/TG3980
08 Lucerne CX Magnatec 5w30/TG3387A
02 DeVille VWB 5w30/CQ Blue
18 Toro Super Recycler T5 10w30
Re: Gas cap leaking [Re: Duffyjr] #4412334
05/23/17 02:01 PM
05/23/17 02:01 PM
Joined: Sep 2015
Posts: 1,595
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,595
USA
Check the seal in the new cap. Also check the neck and tank for cracks.

Re: Gas cap leaking [Re: Duffyjr] #4412406
05/23/17 03:07 PM
05/23/17 03:07 PM
Joined: Mar 2013
Posts: 5,034
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,034
The Midwest
Contact Toro about it. Could be a known issue and they would rather pay to have it fixed rather than going through a CPSC recall. My parents had a Toro push mower back in the 90's with a plastic fuel tank that leaked and it was recalled for the problem.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: Gas cap leaking [Re: mk378] #4412412
05/23/17 03:14 PM
05/23/17 03:14 PM
Joined: Jan 2016
Posts: 716
Nebraska
Duffyjr Online content OP
Duffyjr  Online Content OP
Joined: Jan 2016
Posts: 716
Nebraska
Originally Posted By: mk378
Check the seal in the new cap. Also check the neck and tank for cracks.


When I got the new cap I compared it to the old one and couldn't see any difference, both had the gasket and looked identical. I can't see any cracks in the filler neck but that doesn't mean there isn't one and I just can't see it.

But why would the new cap work for a few weeks then all of a sudden start leaking if it was the cap, and if there is a crack in the tank why is it not leaking all the time.

Last edited by Duffyjr; 05/23/17 03:14 PM.

89 GMC Sierra VWB 5w30/TG3980
08 Lucerne CX Magnatec 5w30/TG3387A
02 DeVille VWB 5w30/CQ Blue
18 Toro Super Recycler T5 10w30
Re: Gas cap leaking [Re: skyactiv] #4412424
05/23/17 03:27 PM
05/23/17 03:27 PM
Joined: Jan 2016
Posts: 716
Nebraska
Duffyjr Online content OP
Duffyjr  Online Content OP
Joined: Jan 2016
Posts: 716
Nebraska
Originally Posted By: skyactiv
Contact Toro about it. Could be a known issue and they would rather pay to have it fixed rather than going through a CPSC recall. My parents had a Toro push mower back in the 90's with a plastic fuel tank that leaked and it was recalled for the problem.


I forgot to mention it's still under warranty and is at the dealer now. I was just looking for some some insight, to me it's very strange it doesn't leak all the time and only after it's been running for a bit.


89 GMC Sierra VWB 5w30/TG3980
08 Lucerne CX Magnatec 5w30/TG3387A
02 DeVille VWB 5w30/CQ Blue
18 Toro Super Recycler T5 10w30
Re: Gas cap leaking [Re: Duffyjr] #4412906
05/24/17 06:11 AM
05/24/17 06:11 AM
Joined: Sep 2004
Posts: 7,818
Marshfield , MA
andyd Online content
andyd  Online Content
Joined: Sep 2004
Posts: 7,818
Marshfield , MA
Uhhmn, Make a gasket for the cap. If you don't have any real gasket material, use a piece cut from a cereal box or a cracker box.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Gas cap leaking [Re: Duffyjr] #4412997
05/24/17 07:57 AM
05/24/17 07:57 AM
Joined: Apr 2010
Posts: 4,559
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline
Joined: Apr 2010
Posts: 4,559
Storrs, Connecticut
It is probably the vent on the cap not working properly or cheaply designed. I have seen this with a few different engines, most of them the Chinese knock off engines which is what I assume this Toro branded engine is.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (36k) - Castrol Edge Euro 0w40, MANN HU816X
Re: Gas cap leaking [Re: Duffyjr] #4413089
05/24/17 09:25 AM
05/24/17 09:25 AM
Joined: Aug 2003
Posts: 11,013
Buffalo, NY
JTK Offline
JTK  Offline
Joined: Aug 2003
Posts: 11,013
Buffalo, NY
It's possible the new cap developed the same leak as the old. Like said, some of these Chonda engine plastics and rubbers are terrible. The cap is shot on the LCT engine on my ~2-3yr/old Ariens snowblower due to cracking.

You need to do some more troubleshooting. Could be the threaded portion of the tank as well.

Last edited by JTK; 05/24/17 09:26 AM.

2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)
Re: Gas cap leaking [Re: Duffyjr] #4413217
05/24/17 12:12 PM
05/24/17 12:12 PM
Joined: May 2006
Posts: 4,045
Central Wisconsin
dwendt44 Offline
dwendt44  Offline
Joined: May 2006
Posts: 4,045
Central Wisconsin
If the tank is near empty, why is there even any gas near the fill cap?
Doesn't sound right. A little splashed gas shouldn't leak out, especially
since a full tank doesn't do that.
Just for giggles, try mowing with the cap not tightened all the way and see
if that changes things.


My 2


There's no such thing as:
Too big of a battery,
Too large of a gas tank,
or too loud of a horn,
or too bright headlights.
Re: Gas cap leaking [Re: dwendt44] #4416525
05/28/17 03:54 PM
05/28/17 03:54 PM
Joined: Jan 2016
Posts: 716
Nebraska
Duffyjr Online content OP
Duffyjr  Online Content OP
Joined: Jan 2016
Posts: 716
Nebraska
Thought I update this. Got the mower back from the dealer with new cap and it's still leaking, this is the third cap including the original. He said he let it sit and run thru a whole tank and it didn't leak. Again the weird part about this whole deal is it doesn't leak even with a full tank at the start of mowing, it's always after I've been mowing for 20 minutes or so.

When I went back the next day the dealer said the only thing he can think of is to try replacing the tank. So I'll keep this updated if nothing else for someone searching down the road.


89 GMC Sierra VWB 5w30/TG3980
08 Lucerne CX Magnatec 5w30/TG3387A
02 DeVille VWB 5w30/CQ Blue
18 Toro Super Recycler T5 10w30
Re: Gas cap leaking (update) [Re: Duffyjr] #4422129
06/04/17 04:52 AM
06/04/17 04:52 AM
Joined: Jan 2016
Posts: 716
Nebraska
Duffyjr Online content OP
Duffyjr  Online Content OP
Joined: Jan 2016
Posts: 716
Nebraska
So the dealer put the new tank on and I picked it up yesterday morning and came home and mowed and believe it or not it is still leaking. Again, not until I'm 3/4 into mowing. I'm having a hard time believing I'm getting faulty parts like this but I guess it's possible.

What's bothering me now is if it isn't the tamk/cap leaking what the problem is, I'm about half afraid to even use it.

Is it possible the tank is building up pressure as the gas is being drawn out thru the carb?

Last edited by Duffyjr; 06/04/17 04:53 AM.

89 GMC Sierra VWB 5w30/TG3980
08 Lucerne CX Magnatec 5w30/TG3387A
02 DeVille VWB 5w30/CQ Blue
18 Toro Super Recycler T5 10w30
Re: Gas cap leaking (update) [Re: Duffyjr] #4422135
06/04/17 05:04 AM
06/04/17 05:04 AM
Joined: May 2010
Posts: 9,470
out there
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,470
out there
Are you sure they really replaced the tank? If they cranked it up and it was not leaking, would they have replaced it. I'd mark the tank somewhere so you know if it gets replaced.


13 elantra 72k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 7300 miles m1 0w30
Re: Gas cap leaking (update) [Re: spasm3] #4422157
06/04/17 06:11 AM
06/04/17 06:11 AM
Joined: Jan 2016
Posts: 716
Nebraska
Duffyjr Online content OP
Duffyjr  Online Content OP
Joined: Jan 2016
Posts: 716
Nebraska
Originally Posted By: spasm3
Are you sure they really replaced the tank? If they cranked it up and it was not leaking, would they have replaced it. I'd mark the tank somewhere so you know if it gets replaced.


I could tell it was new, the old one had a scratch on it that was fairly good size and I seen the old one sitting next to it when I picked it up, but I guess anything is possible.


89 GMC Sierra VWB 5w30/TG3980
08 Lucerne CX Magnatec 5w30/TG3387A
02 DeVille VWB 5w30/CQ Blue
18 Toro Super Recycler T5 10w30
Re: Gas cap leaking (update) [Re: Duffyjr] #4422332
06/04/17 10:13 AM
06/04/17 10:13 AM
Joined: May 2006
Posts: 4,045
Central Wisconsin
dwendt44 Offline
dwendt44  Offline
Joined: May 2006
Posts: 4,045
Central Wisconsin
If the engine is drawing fuel out of the tank, you'd have a
vacuum in the tank, but only if the vent in the cap was clogged/plugged.
This doesn't make sense as the tank would be close to empty when it starts leaking.
Try cracking the cap open about half way through mowing once and see if it still
'leaks'. New tank needs a new cap, but you've already changed that.
It's a mystery. confused


There's no such thing as:
Too big of a battery,
Too large of a gas tank,
or too loud of a horn,
or too bright headlights.
Re: Gas cap leaking (update) [Re: dwendt44] #4426605
06/09/17 07:35 AM
06/09/17 07:35 AM
Joined: Jan 2016
Posts: 716
Nebraska
Duffyjr Online content OP
Duffyjr  Online Content OP
Joined: Jan 2016
Posts: 716
Nebraska
When I went back after they replaced the tank and told him it was still leaking we ended the conversation with him saying he would call someone at Toro and let me know what he found out. This was Saturday the 4th. I hadn't heard anything so yesterday the 8th I decided to stop down. Who ever he talked to told him that he needed to come watch me mow that they don't believe it. In my mind I'm thinking What the [censored] but said that is fine I will call you saturday when I'm ready to mow.

Was just wondering what you think of this coming out to watch me mow?


89 GMC Sierra VWB 5w30/TG3980
08 Lucerne CX Magnatec 5w30/TG3387A
02 DeVille VWB 5w30/CQ Blue
18 Toro Super Recycler T5 10w30
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