| Re: [GMCnet] Fuel system. [message #323667 is a reply to message #323651] |
Sat, 09 September 2017 17:58   |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma:
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Senior Member |
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My chassis VIN is TZE064V101164 and the Avion VIN is A26000 and it has an
Edelbrock air cleaner.
The main thing is how do I keep gas in the filters and fuel lines. I do
plan on replacing the hose part from the fuel pump to the carb. I would
like a pressure tap in there some place.
Is there a check valve in the pump?
Would an air leak between the carburetor and the pump cause the bleed down?
After I get the fuel bleed down problem fixed I plan on installing a Wix
33161 but I do not want to crank the engine long enough to fill that large
filter.
On Sat, Sep 9, 2017 at 11:55 AM, John Wright wrote:
> 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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--
*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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