| [GMCnet] Starting problem [message #94777] |
Thu, 05 August 2010 20:42  |
Bradford Simms
Messages: 7
Registered: July 2010
Karma: 0
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Junior Member |
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Brad,
If it is getting gas to the carb and it is even halfway working, you should
see gas squirt some down when you pump the gas pedal. You can do this by
hand so you can peer down and get a better look.
They say, Gas and Spark. Because you can start it by pouring in a bit of
gas, we have to assume that spark is fine and you are not getting any gas to
the engine. I don't think you are ready for a rebuild yet. Stay after the
no gas in the carb theory. Some of these coaches have several fuel filters.
The "little one" you tossed, I assume, is the one right where the fuel line
goes to the carb? There is one there and they can really clog up.
--
'74 Eleganza, SE
Best Wishes,
George
Brad,
You might try to fill the fuel bowl through the vent tube in the front of
the carb -- small plastic squirt bottle should work. Otherwise, about a
tablespoon of fuel into carb as you did the first time.
When you say the primaries are only opening slightly -- that may be the
choke plate. The secondary air flap is vacuum operated and will not open at
start or usually at all until needed. There is also a smal tang on the front
right side that retains the secondary air flap until the engine is up to
temperature.
Sometimes when you have drained out the fuel the mechanical pump seems to
loose it's prime.
Check for any major leaks -- the hose from the pcv valve to the base of the
carb, line from the emission cannister and such.
Best torque for the carb to manifold is about 9 ft-lb.
Come back and let us know how it worked.
Dennis Sexton
73 PD 230
Germantown, TN
USA
-----Original Message-----
From: Bradford Simms <bradfordsimms@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Mon, Aug 2, 2010 8:14 pm
Subject: [GMCnet] Starting problem
Hi All,
I have been reading the forum for a month now and you folks help us all with
reat information every day, Thanks.
Some background, I am working on a 75 Transmode, told the wife it would tale
few weeks 2 and a bit years ago, I had big holes in both mufflers so
hanged them out and started my baby for the first time in 12 months, "I
now" and she fired right up, but the right muffler was leaking at the
anifold.
Got a couple new flange gaskets and I went to test my work, now 2 weeks
ater she will not start? bugger.
I used the Australian fuel injection method " pour some petrol in the carbie
ate" and she fired right up., Tossed the little filter and checked the
uel pump which is pumping furiously. Ran a fuel line from the pump to fresh
as , nuttin honey
I am not to good with the qudara bog , more a SU man, so not sure what to
ook for , the primary opens a little when cranking and the secondaries seem
ocked shut.
I was thinking I should have the unit rebuilt any ho but do you folks think
hat's the issue?
Thanks to all, Brad
1975 Transmode soon back on the road.
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Message: 17
Date: Tue, 03 Aug 2010 07:22:36 -0500
From: fred veenschoten <fredntoni@cox.net>
Subject: Re: [GMCnet] Starting problem
To: gmclist@temp.gmcnet.org
Message-ID: <170d6.4c580a0c@gmc.mybirdfeeder.net>
Content-Type: text/plain; charset="ISO-8859-15"
http://www.gmcws.org/Tech/quadrajet/index_files/frame.htm
this is a good explanation of the Q-jet. you need to use Internet Explorer
to view it.
--
Fred V
'77 Royale RB 455
P'cola, Fl
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""It's a kind of new mechanical stock pump . I pulled the hose and cranked
the engine and it pumped well ? Used all new hose to draw gas from 5 gal can
so it has gas to the carb I think.
Brad
""
Sounds like the float may be stuck. As someone else mentioned, open the
choke plate by hand, pump the throttle and see if fuel squirts into the
primary (small and front) throats. If not, the carb is probably dry.
Sometimes you can loosen a stuck float by gently tapping the side of the
carb with something like a plastic mallet.
--
Bob de Kruyff
78 Eleganza
Chandler, AZ
Thank's All you Guys for the advice.
I finally had a chance to play on the GMC and Yes I have removed the filter
in the carb. So as suggested I pumped the loud peddle l and no gas is
squirting. All linkages and the accelerator pump actuating arm was moving
fine and it was making a sucking sound so I think you are all telling me the
dreaded float is stuck.
Bob suggested I give it a whack and I gave it a few but still no gas in he
picture. Is there a preferred way and place to whack the carb ? Any next
step ,or is it time to remove it.
I can have the unit rebuilt by the one of the local Hot Rod Dude's for
under $200 and I guess after 35 years it's not an extravagance , As a 75
the coach is smog exempt so I can modify it legally and given 1975 was in
the first generation smog engines would it be best to rebuild the carb stock
or ???
I just do not have the budget to go F I so if I have to stick with a
perfume squirter I would like to get the best set up. possible.
Thanks again Brad
1975 Transmode
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| Re: [GMCnet] Starting problem [message #94789 is a reply to message #94777] |
Thu, 05 August 2010 21:45  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Bob suggested I give it a whack and I gave it a few but still no gas in he
picture. Is there a preferred way and place to whack the carb ? Any next
step ,or is it time to remove it.
Sir: Next step would be use a real metal hammer. A sharp smack or two-three- close to the fuel inlet. Try not to hit the fuel filter housing as the threads are weak. The fuel float is behind the filter. Smack it on the side and top hard enough to shock the needle from the seat. I did a boat motor yesterday that had sat for a year. Maybe turn the engine over while you are doing it. It should work.
Good luck
C. Boyd
76 Crestmont
East Tennessee
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