| [GMCnet] Fuel filter question [message #216265] |
Tue, 30 July 2013 11:47  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
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Senior Member |
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Hi Rob,
Yes, they did install that little boost pump and wired it through the aux switch on the Clasco. I also have a JimK supplied electric fuel pump ahead of the selector valve on the Royale so am very familiar with the anti-vapor lock benefits from such a pump. My comment pertained more to the large front mounted filter/separator they also mounted on the Clasco. I think that may provide some fuel cooling so may be one reason why we have virtually no vapor lock issues with the Clasco. We have more with the Royale, but they are quickly resolved by turning on the electric pump to boost fuel to the mechanical pump.
I may put fuel injection on the Clasco and if I do will need a high pressure pump mounted below the tanks as they push but do not pull fuel up hill. I am thinking a one gallon aluminum surge tank mounted up front might be the way to go. Use the current electric pump and/or the mechanical pump to pull/push gas from the tanks to that front mounted surge tank, then use the high pressure pump mounted on the bottom of the surge tank to pull gas from there to go to the throttle body and return back to the top of the surge tank. I would run another line from the top of the surge tank to the fuel filler down tube as a tank return. That way the actual fuel used by the FI would be somewhat cooled by both the surge tank and the filter/separator up front while the gas going to and from the tanks would be heated by the road and the pumps. Other suggestions clearly welcomed!
Jerry
Jerry Work
78 Royale rear lounge
77 Clasco
Kerby, OR
glwork@mac.com
http://jerrywork.com
541-592-5360 (Sharon)
541-499-1027 (Jerry)
-----------------
Message: 7
Date: Tue, 30 Jul 2013 09:42:32 -0500
From: "Rob Mueller" <robmueller@iinet.net.au>
Subject: Re: [GMCnet] Fuel filter question
To: <gmclist@temp.gmcnet.org>
Message-ID: <E7C57B361AE54186B2F6108741B3F0CD@AcerLaptop>
Content-Type: text/plain; charset="us-ascii"
Jerry,
You noted:
"Fuel is pumped (or pushed) from the tank selector valve to this large filter and from there to the mechanical fuel pump and up to
the carburetor."
Did JimB install a little square Facet fuel pump between the selector valve and the tank that comes on when you switch to AUX?
This would explain why you didn't have any vapor lock problems to speak of. He installed one on Double Trouble and the only problem
I had was going up Eisenhower pass with low fuel in the AUX tank last summer. If I filled up in the mornings and hit the mountains
with a nearly full tank it worked great.
Regards,
Rob M.
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] Fuel filter question [message #216328 is a reply to message #216265] |
Tue, 30 July 2013 20:55  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Jerry,
Let's remove the Royale from this discussion.
The fuel flow on the Clasco with the tank selector switch in MAIN:
1) from the main tank
2) to the selector valve
3) to the large front mounted filter/separator
4) to the mechanical pump
5) to the carb filter
6) to the float chamber
The fuel flow on the Clasco with the tank selector in AUX
1) from the main tank
2) to the small Facet pump
3) to the selector valve
4) to the large front mounted filter/separator
5) to the mechanical pump
6) to the carb filter
7) to the float chamber
You did not have any vapor lock problems when driving the Clasco cross country that required you to go to AUX to pressurize the
inlet of the mechanical pump?"
If the statement above is correct I would say the lack of vapor lock problems was because the mechanical pump used the large filter
/ separator as a reservoir to draw from.
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Work Jerry
Sent: Tuesday, July 30, 2013 11:47 AM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Fuel filter question
Hi Rob,
Yes, they did install that little boost pump and wired it through the aux switch on the Clasco. I also have a JimK supplied
electric fuel pump ahead of the selector valve on the Royale so am very familiar with the anti-vapor lock benefits from such a pump.
My comment pertained more to the large front mounted filter/separator they also mounted on the Clasco. I think that may provide
some fuel cooling so may be one reason why we have virtually no vapor lock issues with the Clasco. We have more with the Royale,
but they are quickly resolved by turning on the electric pump to boost fuel to the mechanical pump.
I may put fuel injection on the Clasco and if I do will need a high pressure pump mounted below the tanks as they push but do not
pull fuel up hill. I am thinking a one gallon aluminum surge tank mounted up front might be the way to go. Use the current
electric pump and/or the mechanical pump to pull/push gas from the tanks to that front mounted surge tank, then use the high
pressure pump mounted on the bottom of the surge tank to pull gas from there to go to the throttle body and return back to the top
of the surge tank. I would run another line from the top of the surge tank to the fuel filler down tube as a tank return. That way
the actual fuel used by the FI would be somewhat cooled by both the surge tank and the filter/separator up front while the gas going
to and from the tanks would be heated by the road and the pumps. Other suggestions clearly welcomed!
Jerry
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GMCnet mailing list
Unsubscribe or Change List Options:
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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