| [GMCnet] What are the ways to return excess gas from the TB back to the tanks? [message #312628] |
Sun, 29 January 2017 23:52  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Floor's repaired today from my ( latest ) floor fire. So I'm going to put the GMC back up on high jack stands to get ready to put a rebuilt trans in. The trans in now is fine. Just a precaution. But then this new one will have about 20,000 less miles on it. That's in a few weeks. So now is the time to mount the EFI fuel pump, and get that return fuel line installed. Not looking for the cheapest, quickest, or shortest. I'm thinking of putting the pump, and steel lines on to outside of the main frame. I've heard comments that putting these thing on the frame in this way. Puts them in harm way. That's a point. But I never drive on gravel. And I could install a shield. Leaving the carb, and it's electric pump in place till I complete the EFI at some later point. Bob Dunahugh 78 Royale Member GMCMI.
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| Re: [GMCnet] What are the ways to return excess gas from the TB back to the tanks? [message #312631 is a reply to message #312629] |
Mon, 30 January 2017 08:38  |
Bob S.
Messages: 143
Registered: October 2012
Location: Rapid City, SD
Karma: 2
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Senior Member |
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When I bought my coach the original owner had installed the old Air Sensors FI on it and installed the fuel return line at that time. He accomplished this by installing a "T" fitting in the fuel filler line. I replaced the old fuel injection with the more modern FITech, used the same system, replaced the fuel line and it works great.
Bob and Pam Schilling
Rapid City, SD
"78 Royale
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| Re: [GMCnet] What are the ways to return excess gas from the TB back to the tanks? [message #312633 is a reply to message #312628] |
Mon, 30 January 2017 08:53 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Considering the abundance of dead truck tire pieces in the road especially in summer, I would plan on the event of having to run over one and sling it at the undercarriage. You try to avoid them with dilligence, but usually the razor wire is spread over 1/4 mile or so. Sometimes you can see the bigger chunks but not the long thin ones which can "lasso" more easily when traffic patterns allow you no choice but to go over them.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] What are the ways to return excess gas from the TB back to the tanks? [message #312634 is a reply to message #312628] |
Mon, 30 January 2017 09:35 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
Karma: 0
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Senior Member |
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It seems some of the FI systems use a seconadary tank that contains the high pressure pump and is fed by the low pressure electric pump from the fuel tanks. The return from the throttle body just dumps back into the small forward tank avoiding running another fuel line running back. John's point on protecting the lines from road hazards is very valid as this would be highly pressurized fuel.
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: [GMCnet] What are the ways to return excess gas from the TB back to the tanks? [message #312673 is a reply to message #312628] |
Tue, 31 January 2017 08:46 |
Bob S.
Messages: 143
Registered: October 2012
Location: Rapid City, SD
Karma: 2
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Senior Member |
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Chris, I removed the air sensors system and sold it to someone here on the forum. I can't remember who. It worked fine, but given its age and lack of parts availability, I decided to replace it. I initially went with a self learning system from a company called Professional Products and ended up getting stung pretty hard on that. When it quit working(complete system failure) I went with FItech. I already had the return line and all the plumbing so I didn't need their fuel command center. So far I am very happy with it. I'm sorry I can't help you with my old Air Sensors unit, but maybe some others on the forum may have one available for you.
Bob and Pam Schilling
Rapid City, SD
"78 Royale
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