| Re: [GMCnet] Fuel system. [message #323651 is a reply to message #323648] |
Sat, 09 September 2017 13:55   |
powerjon
Messages: 2446
Registered: January 2004
Karma:
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Senior Member |
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John,
The Avion was build in 1975 only, some of the pieces may have come from the very last of the 74 parts that were left over making your 75 a very early Avion. Your VIN Chassis identification should be TZE 365 V 10XXXX were the last digits are your chassis number. I also own a 75 Avion that is in the process of a frame up restoration, hope to finish it next year.
As from the factory there should be NO rubber on top of the engine on the fuel line that runs from the fuel pump to the carb! That is a safety hazard and could result in you losing your coach to a fire. The 2 options available are the hard metal line.
http://www.appliedgmc.com/prod.itml/icOid/918
Or the flexible steel braided line with the fire shield jacketing.
http://www.appliedgmc.com/prod.itml/icOid/853
The fact that it takes several seconds to get the enough fuel into the carb is typical. The fuel typically evaporates out of the carb when the engine is warm and then sits for any period of time. Many have added an electric fuel pump back near the selector valve to prime the pump if the coach has been sitting and some have gone to all electric fuel systems eliminating the mechanical pump altogether. This is one way to go or you can build your own.
http://www.appliedgmc.com/prod.itml/icOid/1790
This layout of the electric fuel pump allows you to still use the mechanical fuel pump.
Another change I would suggest in your fuel system is do not use a plastic fuel filter anywhere in your fuel system. The following would be much better and safer. I did use 2 filters in my system, one in the back before the pump and one up front located at the former mechanical fuel pump location feeding the metal line to the carb.
http://www.appliedgmc.com/prod.itml/icOid/1636
Or find one locally that is a 3/8” in and out.
JR Wright
GMC Great Laker MHC
GMC Eastern States Charter Member
GMCGL Tech Editor
GMCMI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan
> On Sep 9, 2017, at 2:02 PM, John Phillips wrote:
>
> Hi,
> I have a 75 Avion built on a 74 chassis.
> The fuel line from the fuel pump to the carburetor has a hose connecting 2
> sections of the line. There are about 2 inches of space between the 2 ends,
> the ends look like they are factory cuts rather than someone just cut 2
> inches out of the line. I have been told there should not be any hose after
> the pump.
>
> I parked in my driveway 4 days ago with the front wheels about 8 inches
> higher than the back wheels.
> The engine has taken several seconds to start if it has not run for a day
> or 2.
> When I took the line apart I was surprised there was no fuel leakage. There
> is a clear fuel filter at the pump input with just a little fuel in it.
>
> What should keep the fuel from running back into the tank so the fuel pump
> does not have to charge the line?
>
> Did the 74 units come with a solid line from the pump to the carburetor?
>
> One good thing is the oil pump has time to lube the engine before it starts
>
> --
>
> *John Phillips*
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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