Author Topic: 27 gallon gas tank install on 16 SC  (Read 6996 times)

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Online Fisherdv

Re: 27 gallon gas tank install on 16 SC
« Reply #125 on: November 27, 2017, 05:36:40 PM »
What would be the safest, and cleanest way to drill out the vent hole? Thick grease on the drill bit to catch the shavings, kinda like chasing a threads in an engine block? Thank you guys for your patience on this :bowdown:
2018, Sea Chaser 16, Honda 60HP

Offline blindmonkey

Re: 27 gallon gas tank install on 16 SC
« Reply #126 on: November 27, 2017, 05:50:31 PM »
Try making the vent hose as vertical as possible first so no low areas exist first as per 3weights suggestion. From the photo posted it looks like it has extra length that is causing low spots near the tank which would hold gas and restrict air flow.  Mine is almost vertical.
Lorne
2013 17' Sea Chaser, Honda 90, Yamaha F8
1994 Sea Explorer, Mercury 60, SOLD

Online Fisherdv

Re: 27 gallon gas tank install on 16 SC
« Reply #127 on: November 27, 2017, 05:56:57 PM »
Try making the vent hose as vertical as possible first so no low areas exist first as per 3weights suggestion. From the photo posted it looks like it has extra length that is causing low spots near the tank which would hold gas and restrict air flow.  Mine is almost vertical.
I did cut some length off of the vent hose to make it more straight and didnt help
2018, Sea Chaser 16, Honda 60HP

Offline Croaker Stroker

Re: 27 gallon gas tank install on 16 SC
« Reply #128 on: November 27, 2017, 06:06:16 PM »

Drill motors make sparks.
1987 - 17' Sea Pacer - 2004 Evinrude 90 E-tec
15' Sea Sprinter - **SOLD**

"If a fish will, he will… if he won't, he won't… and that's about it… except… he may take this when he won't take that."

Online Fisherdv

Re: 27 gallon gas tank install on 16 SC
« Reply #129 on: November 27, 2017, 06:06:28 PM »
Yeah I thought about the drill making sparks to, probably not a good idea. I measured the vent hole coming off of the tank and it is only a quarter inch inner diameter going to a five eights inner diameter hose. I don’t think it’s the vent P-trap because I can blow through it with no problem
2018, Sea Chaser 16, Honda 60HP

Offline Croaker Stroker

Re: 27 gallon gas tank install on 16 SC
« Reply #130 on: November 27, 2017, 06:08:57 PM »
Yeah I thought about the drill making sparks to, probably not a good idea. I measured the vent hole coming off of the tank and it is only a quarter inch inner diameter going to a five eights inner diameter hose. I don’t think it’s the vent P-trap because I can blow through it with no problem

But you are blowing through it when it is dry. I think when gas burps up into the p-trap it may be designed to shut.

Your tank fills fast with the vent open.  If you called the tank manufacturer, they could tell you if 1/4” vent is adequate.
1987 - 17' Sea Pacer - 2004 Evinrude 90 E-tec
15' Sea Sprinter - **SOLD**

"If a fish will, he will… if he won't, he won't… and that's about it… except… he may take this when he won't take that."

Online Fisherdv

Re: 27 gallon gas tank install on 16 SC
« Reply #131 on: November 27, 2017, 06:14:11 PM »
 Do you think if I try to fill up with the P-trap disconnected from the hose that I’ll get gas squirting out of that open hose?
2018, Sea Chaser 16, Honda 60HP

Offline Croaker Stroker

Re: 27 gallon gas tank install on 16 SC
« Reply #132 on: November 27, 2017, 06:54:51 PM »
Do you think if I try to fill up with the P-trap disconnected from the hose that I’ll get gas squirting out of that open hose?

I don’t know. Probably only when your tank is full.

All of the earlier boats had tanks vented in this way. Just a hose overboard, or into the motor well, and a chrome scoop to prevent water intrusion.





« Last Edit: November 27, 2017, 07:29:18 PM by Croaker Stroker »
1987 - 17' Sea Pacer - 2004 Evinrude 90 E-tec
15' Sea Sprinter - **SOLD**

"If a fish will, he will… if he won't, he won't… and that's about it… except… he may take this when he won't take that."

Offline Croaker Stroker

Re: 27 gallon gas tank install on 16 SC
« Reply #133 on: November 27, 2017, 07:25:05 PM »
...  actually, yours looks designed to prevent water intrusion. (Instead of a loop in your vent line). Looks restrictive ?

I am not sold on those new fangled contraptions.   :hoboy: :jester:
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« Last Edit: November 27, 2017, 07:42:55 PM by Croaker Stroker »
1987 - 17' Sea Pacer - 2004 Evinrude 90 E-tec
15' Sea Sprinter - **SOLD**

"If a fish will, he will… if he won't, he won't… and that's about it… except… he may take this when he won't take that."

Online Fisherdv

Re: 27 gallon gas tank install on 16 SC
« Reply #134 on: November 27, 2017, 07:51:04 PM »
Yeah I think all the EPA stuff has really gone too far. If you look at the EPA portable tanks they don’t vent into the atmosphere but when you open the cap you get like 10 times as much coming out all at once how does that save the atmosphere? And if the P-trap vent that I have is supposed to save the atmosphere how does that help when I’m spilling gallons of fuel on the ground while filling?  :hoboy: I can only imagine the set ups that vent into the charcoal canister’s
« Last Edit: November 27, 2017, 07:54:49 PM by Fisherdv »
2018, Sea Chaser 16, Honda 60HP

Offline AJFishin

Re: 27 gallon gas tank install on 16 SC
« Reply #135 on: November 27, 2017, 09:47:41 PM »
It looks to me like your fuel tank vent is smaller then what the guidelines say it should be.
Your fuel tank vent looks to be about a 1/4". Have you measured it?
I think what Danno said on pg 5 is right about the factory not measuring the thickness of that tank vent.

From the USCG regarding the size of fuel tank vents:



Here's a link for the USCG, page 34.
http://www.uscgboating.org/assets/1/AssetManager/ABYC.1002.01.pdf

Here's another link outlining the ID of a boats fuel tank vents:
https://www.boatsafetyscheme.org/boat-examination/non-private-boats/part-2-inboard-engines/vent-pipes/
« Last Edit: November 27, 2017, 09:51:32 PM by AJFishin »
'96 Sea Chaser 16 - Yamaha 70HP - 2 smoke

! Go Kings Go !

Online Fisherdv

Re: 27 gallon gas tank install on 16 SC
« Reply #136 on: November 27, 2017, 09:57:55 PM »
It looks to me like your fuel tank vent is smaller then what the guidelines say it should be.
Your fuel tank vent looks to be about a 1/4". Have you measured it?
I think what Danno said on pg 5 is right about the factory not measuring the thickness of that tank vent.

From the USCG regarding the size of fuel tank vents:



Here's a link for the USCG, page 34.
http://www.uscgboating.org/assets/1/AssetManager/ABYC.1002.01.pdf

Here's another link outlining the ID of a boats fuel tank vents:
https://www.boatsafetyscheme.org/boat-examination/non-private-boats/part-2-inboard-engines/vent-pipes/

AJFishin, that’s it! Good find! That article says 9/16, with a MINIMUM 7/16 ID vent hole. Mine is 1/4, which is 4/16, half the size of what’s called for according to that write up. I suspected that vent hole was too small
« Last Edit: November 27, 2017, 10:53:46 PM by Fisherdv »
2018, Sea Chaser 16, Honda 60HP

Online Fisherdv

Re: 27 gallon gas tank install on 16 SC
« Reply #137 on: November 27, 2017, 10:06:06 PM »
 That would also explain why fuel was squirting (as if under pressure) from the tank vent with the hose removed. I can see splashing , but it was squirting. Vent too small, to much pressure build up
2018, Sea Chaser 16, Honda 60HP

Offline Yachter Yat

Re: 27 gallon gas tank install on 16 SC
« Reply #138 on: November 28, 2017, 06:10:50 AM »
   Fisher: CAUTION:  HEED CROAKER'S WARNING!   DO NOT drill that tank with an electrically powered device!   Find a hand ream, or something similar.  You won't be able to get on-line service to this site when you're sitting on the Moon.  :hoboy:

Yat
Dear Arima:  Please "square-off" the Hunter transom.  Make it like my old 77 Silverline.  Thank you.  Oh yeah...please hurry; I'm getting old.

16 SC/Honda 60

Online Fisherdv

Re: 27 gallon gas tank install on 16 SC
« Reply #139 on: November 28, 2017, 06:25:57 AM »
Yes Yat, the 4th of July is over and I will NOT use a power drill, or a vacuum. So how do I tap that hole without getting  large twists of plastic in the tank that could block a fuel line?
2018, Sea Chaser 16, Honda 60HP

Offline Yachter Yat

Re: 27 gallon gas tank install on 16 SC
« Reply #140 on: November 28, 2017, 07:14:23 AM »
   I'll have to work on that, but I think a drill bit (being turned by hand) should be able to cut through that plastic.  You'd have to get creative with finding a way to attach something to the bit that would give you enough leverage in order to twist it. Problem is, there's not a lot of room in there.  Course, that doesn't solve the problem relating to the plastic debris.  Guess I'll have to look around the garage. :jester:

Yat
Dear Arima:  Please "square-off" the Hunter transom.  Make it like my old 77 Silverline.  Thank you.  Oh yeah...please hurry; I'm getting old.

16 SC/Honda 60

Online Fisherdv

Re: 27 gallon gas tank install on 16 SC
« Reply #141 on: November 28, 2017, 07:31:42 AM »
I can get a hand drill that has a handle to turn for leverage or a T handle style ream. I’m thinking maybe put grease or thick oil on the drill bit to catch the plastic shavings what do you think
2018, Sea Chaser 16, Honda 60HP

Offline Rokefin

Re: 27 gallon gas tank install on 16 SC
« Reply #142 on: November 28, 2017, 08:18:17 AM »
If it is indeed a bad design the manufacturer should replace your tank. I would get a hold of the manufacturer and open the discussion with them.  Looks like the vent is too small, as previously mentioned if you open it up do not make the nipple too thin.....again, I would get a hold of the manufacturer.   
Boatless
Gone - 1989 17ft Arima Sea Chaser 2010 115 Yamaha 1995 9.9 Yamaha kicker - Bodega mostly

Online Danno

Re: 27 gallon gas tank install on 16 SC
« Reply #143 on: November 28, 2017, 08:32:44 AM »
I can get a hand drill that has a handle to turn for leverage or a T handle style ream. I’m thinking maybe put grease or thick oil on the drill bit to catch the plastic shavings what do you think

Yep, use  a T-handle similar to those used for taps.

When turning by hand, you're not likely to get the small particles generated by a high speed drill. The plastic is relatively soft as well so it will cut easily and create the typical long spiral pieces. I like the idea of using grease on the drill bit to get everything possible to stick to it.
Previously owned a 1998 19' SR

Lures are designed to catch fishermen not fish.

Offline Yachter Yat

Re: 27 gallon gas tank install on 16 SC
« Reply #144 on: November 28, 2017, 09:06:21 AM »
   The fuel fill hose might be a little close for anything too long.  Perhaps you could attach a ratcheting driver handle? 

Yat
Dear Arima:  Please "square-off" the Hunter transom.  Make it like my old 77 Silverline.  Thank you.  Oh yeah...please hurry; I'm getting old.

16 SC/Honda 60

Online Fisherdv

Re: 27 gallon gas tank install on 16 SC
« Reply #145 on: November 28, 2017, 09:12:13 AM »
If it is indeed a bad design the manufacturer should replace your tank. I would get a hold of the manufacturer and open the discussion with them.  Looks like the vent is too small, as previously mentioned if you open it up do not make the nipple too thin.....again, I would get a hold of the manufacturer.   
I think that would be my best option before I do any modifications to the tank.
2018, Sea Chaser 16, Honda 60HP

Offline Croaker Stroker

Re: 27 gallon gas tank install on 16 SC
« Reply #146 on: November 28, 2017, 09:16:34 AM »
If it is indeed a bad design the manufacturer should replace your tank. I would get a hold of the manufacturer and open the discussion with them.  Looks like the vent is too small, as previously mentioned if you open it up do not make the nipple too thin.....again, I would get a hold of the manufacturer.

+1
1987 - 17' Sea Pacer - 2004 Evinrude 90 E-tec
15' Sea Sprinter - **SOLD**

"If a fish will, he will… if he won't, he won't… and that's about it… except… he may take this when he won't take that."

Offline Rokefin

Re: 27 gallon gas tank install on 16 SC
« Reply #147 on: November 28, 2017, 10:52:25 AM »
I'm sure Don will get you squared away.....but another thought I had was possibly a tee off your vent nipple and running 2 vent lines - possibly may give enough venting to allow normal fill operations.
Boatless
Gone - 1989 17ft Arima Sea Chaser 2010 115 Yamaha 1995 9.9 Yamaha kicker - Bodega mostly

Online Fisherdv

Re: 27 gallon gas tank install on 16 SC
« Reply #148 on: November 28, 2017, 10:59:04 AM »
I'm sure Don will get you squared away.....but another thought I had was possibly a tee off your vent nipple and running 2 vent lines - possibly may give enough venting to allow normal fill operations.
It’s the vent nipple itself that’s too small
2018, Sea Chaser 16, Honda 60HP

Offline Rokefin

Re: 27 gallon gas tank install on 16 SC
« Reply #149 on: November 28, 2017, 11:14:19 AM »
Yes, I did realize the vent was too small, my thought was an extra line might allow it to breathe enough but I guess being restricted at the vent nipple itself not much will help.
I am curious looking at the engineering part of this why/how did they come up with such a small diameter nipple :shrug9:
Boatless
Gone - 1989 17ft Arima Sea Chaser 2010 115 Yamaha 1995 9.9 Yamaha kicker - Bodega mostly