RE: Brass clunk in gas fuel.  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Gas Engines >> RE: Brass clunk in gas fuel.
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RE: Brass clunk in gas fuel. - 5/18/2008 12:35:25 PM   
rc bugman



Posts: 882
Joined: 1/16/2002
From: Ithaca, NY, USA
Status: offline 		Hi,

I would suggest that karolh's gas does not have alcohol in it. The moisture condensenses from the air and accumulates in the tank. In the North where it gets cold, we put alcohol in the gas to suspend the water in the tank so it passes through the engine and out the exhaust. It is called "gas line antifreeze". Otherwise, the water freezes in the fuel line and the engine don't run and you are stuck in a cold place.

Perhaps, if Karolh added a small amt of methanol to his fuel, he would eliminate the moisture accumulation in the tank.

Elson

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(in reply to Tired Old Man)
       Post #: 26

RE: Brass clunk in gas fuel. - 5/18/2008 5:38:55 PM   
karolh


 

Posts: 2314
Joined: 5/15/2002
From: Mandeville, JAMAICA
Status: offline 		I switched from a two line system as I seemed to have the knack of getting crud into my fuel via firewall mounted Quick Fill connectors I used. Going to three lines eliminated that problem, but as it turned out caused another. So far I have not experienced any problems with the additional clunk interfering with the feed.

Karol

(in reply to Tired Old Man)
       Post #: 27

RE: Brass clunk in gas fuel. - 5/21/2008 3:55:04 AM   
show871



Posts: 192
Joined: 8/28/2007
From: Fort collins, CO, USA
Status: offline
quote:

ORIGINAL: Pat Roy

Sorry but the photo I needed for more input was on a different laptop and I wasn't where it was at the time. Brass reacting with residual oil after a prolonged period sitting in an empty tank does that. I use what's in the picture. It will work up to at least a 115cc engine and probably a lot more. You can't get any more fuel in a carb than what the size of the carb inlet permits and this filter equals or exceeds the size of most carb inlets. Just like fuel tubing, where anything larger than the medium stuff is a waste of money.

This filter has a nasty habit of eliminating bubbles in the fuel line and picking up every last drop of gas before the engine runs dry I use one in the gas can and one in the plane. Don't need no stinking paper filters


Where would a good place be to look for one of these locally?????

(in reply to Tired Old Man)
       Post #: 28

RE: Brass clunk in gas fuel. - 5/21/2008 5:14:56 AM   
RTK


 

Posts: 3953
Joined: 4/20/2003
From: CENTRAL , CA, USA
Status: offline 		Go to any local lawnmower/saw shop. That is what all the weedies/chainsaws use

(in reply to show871)
       Post #: 29

RE: Brass clunk in gas fuel. - 5/21/2008 6:41:30 AM   
vertical grimmace


 

Posts: 1145
Joined: 3/13/2004
From: ft collins , CO, USA
Status: offline 		This is one of the reasons I like the Bennett built tanks. The fittings that come with them are great for a 3 line setup and also get you away from the pesky stoppers. IMO once you use a Bennett tank you will never go back. I just wish they had a 24oz size.

(in reply to RTK)
       Post #: 30

RE: Brass clunk in gas fuel. - 5/21/2008 1:11:07 PM   
show871



Posts: 192
Joined: 8/28/2007
From: Fort collins, CO, USA
Status: offline 		Thanks RTK

Yea, my motor has msc rpm bursts here and there, I really hope this solves the problem!

871

(in reply to RTK)
       Post #: 31

RE: Brass clunk in gas fuel. - 5/21/2008 1:24:17 PM   
karolh


 

Posts: 2314
Joined: 5/15/2002
From: Mandeville, JAMAICA
Status: offline 		Using felt filtered clunks are really the way to go with as by themselves they eliminate quite a few of our usual tank related problems.

Karol

(in reply to show871)
       Post #: 32

RE: Brass clunk in gas fuel. - 5/22/2008 5:11:39 AM   
OldRookie


 

Posts: 637
Joined: 12/11/2001
From: Prior Lake, MN, USA
Status: offline 		I'm just mentioning this about the felt Walbro filters.
I thought it would be a good idea for my twin OS 46 powered plane. I was going to break in the engines, and found out that the filter would restrict the fuel enough, that I couldn't richen out a 46 size engine. I'm only going to use them for gas from now on.

Greg

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RE: Brass clunk in gas fuel. - 5/22/2008 2:38:53 PM   
captinjohn


 

Posts: 5847
Joined: 1/25/2002
From: Hesperia, MI, USA
Status: offline
quote:

ORIGINAL: rc bugman

Hi,

I would suggest that karolh's gas does not have alcohol in it. The moisture condensenses from the air and accumulates in the tank. In the North where it gets cold, we put alcohol in the gas to suspend the water in the tank so it passes through the engine and out the exhaust. It is called "gas line antifreeze". Otherwise, the water freezes in the fuel line and the engine don't run and you are stuck in a cold place.

Perhaps, if Karolh added a small amt of methanol to his fuel, he would eliminate the moisture accumulation in the tank.

Elson

I am not so sure adding methanol to the fuel would help? I have seen the same green crud build up in spots with airplanes setup completely for glow fuel...with lots of methanol! Best Regards Capt,n

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(in reply to rc bugman)
       Post #: 34

RE: Brass clunk in gas fuel. - 5/23/2008 2:23:18 AM   
rc bugman



Posts: 882
Joined: 1/16/2002
From: Ithaca, NY, USA
Status: offline 		Hi,

Too much methanol as in alcohol based fuels adsorb water. A little methanol in gasoline allows the water to remain in suspension and it is "burned" with the gasoline. The OH end of the alcohol "binds" with the HOH of water and the CH3 end of the alcohol "binds" with the hydrocarbon (gasoline). This allows the water to remain in suspension within a hydrocarbon like gasoline.

Elson

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Using this Hobby for Science (aerobiology)

(in reply to captinjohn)
       Post #: 35

RE: Brass clunk in gas fuel. - 5/25/2008 12:02:25 PM   
The Raven



Posts: 594
Joined: 1/6/2005
From: Melbourne, AUSTRALIA
Status: online 		A late response but....

Given that most gasoline powered engines use some brass fittings (take a look at any carb equipped car) it's not the gasoline affecting the brass. Odds are it's something else in the fuel (eg. oil or alcohol) or the clunk is not brass at all.

(in reply to rc bugman)
       Post #: 36

RE: Brass clunk in gas fuel. - 5/26/2008 3:52:30 AM   
captinjohn


 

Posts: 5847
Joined: 1/25/2002
From: Hesperia, MI, USA
Status: offline
quote:

ORIGINAL: rc bugman

Hi,

Too much methanol as in alcohol based fuels adsorb water. A little methanol in gasoline allows the water to remain in suspension and it is "burned" with the gasoline. The OH end of the alcohol "binds" with the HOH of water and the CH3 end of the alcohol "binds" with the hydrocarbon (gasoline). This allows the water to remain in suspension within a hydrocarbon like gasoline.

Elson

RC bugman: You therory sounds right on...I missed that...my bad. Capt,n

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(in reply to rc bugman)
       Post #: 37

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