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Re: [GMCnet] &@":'#^>#! Mice! [message #323850 is a reply to message #323847]

Wed, 13 September 2017 17:07

James Hupy

Messages: 6806
Registered: May 2010

Karma:

Senior Member

That is why GM changed the configuration of the fuel filler plumbing. They
have a larger metal pipe with an elbow on the main tank that is a molded
hose, slightly bigger on the upstream side, slightly constricted on the
other end of the elbow where it enters the rear tank. That provides a flow
restriction into the main tank that does two things. It slows the filling
rate to the main tank, and minimizes that "big slug of gas" back out the
tank vent hose.
But, that "big slug of gas" is necessary to cancel the pump nozzle, so you
cannot eliminate it altogether. I always fill on the slowest position on
the pump. On my coach, it seems to work better for me. I do stand right by
the nozzle with my remaining good ear close enough to hear the fuel going
in. When the pitch changes, I slow the fill rate. Not perfect but no dual
tank setup with a siamese fill manifold is.
Jim Hupy
Salem, Or
78 GMC ROYALE 403

On Sep 13, 2017 2:26 PM, "Matt Colie" wrote:

> Richard Denney wrote on Wed, 13 September 2017 11:20
>> Matt,
>>
>> I found that old listing, and now I know what you mean by "high". To
> summarize what I think I read, you ran two 3/8" fill vent lines to the front
>> and up into the space behind the interior panel that covers the plumbing
> for the fuel filler neck. And then you teed them into a half-inch hose
>> right below where the half-inch hose fits on the filler neck.
>>
>> And the reason is that the main tanks fills first--the flow from the gas
> pump pushes fuel into the rear tank before doing much filling of the
>> front tank, and when full it blasts a shot of gasoline into the
> fill-vent tubing before much fuel enters the front tank. With the TEE in
> the rear,
>> that blast of fuel blocks air flow in the vent from the front tank,
> forcing the front tank to fill very slowly and unhappily. So, the first 25
> goes
>> in easy, and the second 25 doesn't. With the TEE in the front and right
> under the filler neck, that blast of fuel doesn't make it into the fill vent
>> for the front tank, and it can vent as it fills as it should. The usual
>> practice of filling on the slow setting is a partial solution because it
> makes it easier for the tanks to equalize a bit as they fill--there isn't
>> quite as much dynamic flow pushing past the side opening into the front
> tank.
>>
>> Did I get that right?
>>
>> I'll do this in the future--don't have to drop the tanks to do it and I
> can manage this one in my driveway.
>>
>> Rick "who'll probably get a response to this in person in Elkhart,
> assuming everything goes together well tomorrow" Denney
>
>
> Rick,
>
> Do you know of a silly multi-letter response that means - "You Got It" ?
>
> I didn't have the cab apart when I did it, so I put that T just under the
> cab flood and it worked out great.
>
> Hope to see you in Elkhart.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
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[Message index]

		[GMCnet] &@":'#^>#! Mice! By: Richard Denney on Fri, 01 September 2017 18:04
		Re: [GMCnet] &@":'#^>#! Mice! By: Harry on Fri, 01 September 2017 22:11
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Fri, 01 September 2017 22:32
		Re: [GMCnet] &@":'#^>#! Mice! By: k2gkk on Sat, 02 September 2017 10:33
		Re: [GMCnet] &@":'#^>#! Mice! By: Sandra Price on Sat, 02 September 2017 11:23
		Re: [GMCnet] &@":'#^>#! Mice! By: jimk on Sat, 02 September 2017 09:54
		Re: [GMCnet] &@":'#^>#! Mice! By: Emery Stora on Sat, 02 September 2017 10:23
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Sat, 02 September 2017 13:50
		Re: [GMCnet] &@":'#^>#! Mice! By: emerystora on Sat, 02 September 2017 14:00
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Sat, 02 September 2017 15:51
		Re: [GMCnet] &@":'#^>#! Mice! By: Emery Stora on Sat, 02 September 2017 16:13
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Sat, 02 September 2017 16:39
		Re: [GMCnet] &@":'#^>#! Mice! By: RF_Burns on Sat, 02 September 2017 19:41
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Sat, 02 September 2017 20:06
		Re: [GMCnet] &@":'#^>#! Mice! By: Ken Henderson on Sat, 02 September 2017 21:43
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Sat, 02 September 2017 22:14
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Sat, 02 September 2017 22:15
		Re: [GMCnet] &@":'#^>#! Mice! By: Matt Colie on Sun, 03 September 2017 08:03
		Re: [GMCnet] &@":'#^>#! Mice! By: Ken Henderson on Sun, 03 September 2017 11:08
		Re: [GMCnet] &@":'#^>#! Mice! By: <rallymaster on Sun, 03 September 2017 22:14
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Mon, 04 September 2017 21:19
		Re: [GMCnet] &@":'#^>#! Mice! By: Ken Henderson on Mon, 04 September 2017 22:24
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Sat, 09 September 2017 15:00
		Re: [GMCnet] &@":'#^>#! Mice! By: GatsbysCruise on Tue, 05 September 2017 13:27
		Re: [GMCnet] &@":'#^>#! Mice! By: jhbridges on Tue, 05 September 2017 14:27
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Mon, 11 September 2017 22:59
		Re: [GMCnet] &@":'#^>#! Mice! By: Matt Colie on Tue, 12 September 2017 07:58
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Tue, 12 September 2017 09:25
		Re: [GMCnet] &@":'#^>#! Mice! By: Mr ERFisher on Tue, 12 September 2017 11:39
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Tue, 12 September 2017 12:28
		Re: [GMCnet] &@":'#^>#! Mice! By: Matt Colie on Tue, 12 September 2017 16:38
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Wed, 13 September 2017 10:20
		Re: [GMCnet] &@":'#^>#! Mice! By: Matt Colie on Wed, 13 September 2017 16:25
		Re: [GMCnet] &@":'#^>#! Mice! By: James Hupy on Wed, 13 September 2017 17:07
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Thu, 14 September 2017 21:55
		Re: [GMCnet] &@":'#^>#! Mice! By: Ken Henderson on Thu, 14 September 2017 22:09
		Re: [GMCnet] &@":'#^>#! Mice! By: Richard Denney on Thu, 14 September 2017 22:51

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