| [GMCnet] Fuel return line [message #252178] |
Sun, 15 June 2014 11:46  |
Jeff Marten
Messages: 199
Registered: August 2013
Karma: 1
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Took the GMC to the lake yesterday to meet a friend who purchased a 'newsed' boat a couple weeks ago. (very jealous since my boat's engine is still waiting on the machine shop to finish up the heads).
Temp was about 93* in Pueblo, Co. It had horrible vapor lock; died or tried every time we stopped for more than 10sec. Each stop I'd throw it in neutral and run ~3000rpm to try to keep the fuel moving.
What's the best way to add a return line? Add it to the tank, or filler tube?
I'm going to tee into the feed line just before the carb, run the return to either the main tank or the filler tube near the tank.
Jeff Marten
1978 Royale
Colorado Springs, Co
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1985 Gulf Stream 34' Sun Stream
1964 Falcon 'Vert
1980 Bradley GTE
1999 Chevy Tahoe
2005 Saab 93 Aero
1987 Suzuki Intruder 1400
1978 Glastron/Carlson CV23
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| Re: [GMCnet] Fuel return line [message #252188 is a reply to message #252178] |
Sun, 15 June 2014 12:18  |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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You will need some restriction in the return line. A #50 drill works fine on the GMC. This size was determined by measuring the orifice on a fuel filter with a return line fitting. My carb and return line is fed by a Carter 4070. Not sure of the number but it is the Carter preferred for the GMC.
As far as the best place to plumb the return. Tank or filler neck should make no difference. This is usually determined by what is most convenient or possible.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Fuel return line [message #252195 is a reply to message #252188] |
Sun, 15 June 2014 12:42 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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midlf wrote on Sun, 15 June 2014 11:18You will need some restriction in the return line. A #50 drill works fine on the GMC. This size was determined by measuring the orifice on a fuel filter with a return line fitting. My carb and return line is fed by a Carter 4070. Not sure of the number but it is the Carter preferred for the GMC.
As far as the best place to plumb the return. Tank or filler neck should make no difference. This is usually determined by what is most convenient or possible.
Speaking of that, is anyone here running a return line from the carb inlet fitting?
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Fuel return line [message #252199 is a reply to message #252195] |
Sun, 15 June 2014 13:14 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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I had a pressure regulator with a return hose at the carb inlet fitting.
It was plumbed with rubber hoses. When I changed out my engine I replaced
the rubber line to metal and relocated the pressure regulator to just above
cross member. The return line was plumbed into the filler neck.
On Sun, Jun 15, 2014 at 11:42 AM, Bob de Kruyff wrote:
> midlf wrote on Sun, 15 June 2014 11:18
>> You will need some restriction in the return line. A #50 drill works
> fine on the GMC. This size was determined by measuring the orifice on a
>> fuel filter with a return line fitting. My carb and return line is fed
> by a Carter 4070. Not sure of the number but it is the Carter preferred for
>> the GMC.
>>
>> As far as the best place to plumb the return. Tank or filler neck
> should make no difference. This is usually determined by what is most
>> convenient or possible.
>
> Speaking of that, is anyone here running a return line from the carb inlet
> fitting?
> --
> Bob de Kruyff
> 78 Eleganza
> Chandler, AZ
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] Fuel return line [message #252203 is a reply to message #252195] |
Sun, 15 June 2014 15:10 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Bob de Kruyff wrote on Sun, 15 June 2014 12:42
Speaking of that, is anyone here running a return line from the carb inlet fitting?
My pump from the surge tank runs up to a fuel distribution block about 6" from the carb. The return line is connected to this fuel block and returns to the surge tank, The restriction orifice is located at the fuel block end of the return line.
In tank fuel pumps feed the surge tank and there is a return line from the surge tank to the aux tank. The surge tank is about 1 gallon. All the lines from the fuel block are insulated.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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