| Re: [GMCnet] Assorted fuel issues [message #323325 is a reply to message #323320] |
Mon, 04 September 2017 16:23   |
sgltrac
Messages: 2797
Registered: April 2011
Karma:
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Senior Member |
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Sounds like a seal problem within the carb allowing the fuel to slink away.
Maybe install a fuel line check valve to lock the fuel in the line. I did a
quick internet search and it looks like less than $20.
Sully
77 eleganza 2
Bellevue.
On Mon, Sep 4, 2017 at 1:15 PM Paul Zerkel wrote:
> I have a 1978' with a 455 with a Edelbrok performer intake manifold, with
> what I believe to be the original 403 carburetor installed. Electric choke
> on the carburetor, but I do not believe the choke has ever Benin quite
> "right" since I Have owned coach. I.e. The choke plate does not completely
> close when I step up n the accelerator pedal.
>
> I have only the original mechanical fuel pump installed. I did replace
> that pump ~3 years ago with one from one of the GMC Suppliers.
>
> The coach has always been hard to start after it sits for a couple days.
> It always took lots of cranking, but would eventually start. I have
> suspected
> that my carburetor needs attention as I do not believe it should leak down
> that fast.
>
> I feel I have a good understanding of how the two tanks are
> interconnected. Until about 3 months ago, my fuel gauge worked (and seems
> reasonable
> accurate-given miles driven and gasoline pumped). But now the gauge reads
> empty when set to AUX, but seems correct for the main tank. I presume this
> is due to loose connection in the line wither to the valve switch.
>
> Also at that time, it became virtually impossible to start the coach, if
> it has sat for more than 24 hours. I can crank for two or three minutes and
> no joy.
>
> I have pulled the fuel line out of carb and put in bottle, and I do not
> see fuel ( which I presume means I need to replace fuel pump again).
>
> I have acquired a boat tank, and hook that to the input of the fuel pump,
> and it will start on the 2nd or 3rd revolution.
>
> Now I come the part I do not understand....
>
> If I run in from the fuel tank briefly (30 seconds - 2 minutes), and then
> re-connnect the main fuel line, I can drive it that way for miles. It can
> shut it off, and as long as I start it within an hour or so, it will fire
> right up from the main tanks. Wait 24 hours, and forget about it though.
>
> Is it his is a failure mode of the mechanical fuel pumps?
>
> I have read several of the threads on here about electric fuel pumps, and
> it seems a lot of people have them, and a lot of people have issues with
> them too. Also, there seems to be a lot of options about where and how to
> plumb them and wire them. I must admit, I like the simplicity of the
> mechanical pump, and I know it used to work better than it did before.
>
> Part of me thinks putting an electric pump in now, would just mask
> whatever real problems I need to solve.
>
> So what do I attack first?
>
> Thanks.
>
> --
> Paul Zerkel
> '78 Eleganza II
> Salisbury IL (near Springfield)
>
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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