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10-06-2013, 04:00 AM
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#1
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Gear heads, listen up
Question for ya
My antique service truck may sit for 3-6 month's or longer and when I go to start it up, it cranks and cranks for a long time, I have to give it the either spray a few times then it is OK. When it get's gas, it is good, even if it sits for 3 weeks or so, starts with just a touch of the starter.
It is a 1976 Chevy 3/4 Ton truck, 350 Chevy Gas engine, 4 BBL.
I thought of rebuilding the carb, but then I says to myself Hershel, it could be the fuel pump.. or something...
When I crank after a long sit, it still doesn't get gas to the carb, or, more precisely worded, it doesn't start. Not until I prime it.
What say you, my learned Gear heads?
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10-06-2013, 04:56 AM
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#2
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Montana Master
Join Date: Sep 2008
Location: Bangor
Posts: 770
M.O.C. #8816
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I would disconnect the fuel pump out line to the carb and crank it a few times. If your get good flow the pump should be good. After it sits a week or so remove the air cleaner so you can look down inside the carb. Look for the jets and move the throttle like your stepping on the gas and see if gas is sprayed into the venturi to see if it is getting gas. More than likely a carb cleaning or rebuild is in order.
kevin
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10-06-2013, 05:00 AM
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#3
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Thanks Kevin, I shall do just that!
Ozz
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10-06-2013, 06:25 AM
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#4
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Montana Master
Join Date: Apr 2009
Location: Murrieta
Posts: 5,816
M.O.C. #9257
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Gas conditioner/stabilizer? There's an additive to add to the gas tank that stabilizes the fuel when it sits for a LONG time. Maybe that would help. Hopefully some one more in the know can describe what I've only read about regarding what happens when gas sits for a while.
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10-06-2013, 07:19 AM
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#5
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Montana Master
Join Date: Jun 2010
Location: Colorado Springs
Posts: 3,335
M.O.C. #10496
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Is the gas fresh?
Consider varnish in the carb as a possible issue. Float sticking?
Good suggestions so far..
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10-06-2013, 09:46 AM
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#6
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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I am all over that fuel stabilizer, use Stable in everything, always store with a fresh tank of gas also.
The truck starts 'freaky' fast otherwise
Ponderous, just ponderous
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10-06-2013, 10:24 AM
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#7
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Montana Master
Join Date: Oct 2007
Location: silver creek
Posts: 1,507
M.O.C. #7770
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Any of those "old" trucks and cars with carbs will always start hard after a long sit. I am sure the carb has drained back and the balance of fuel has evaporated. Just think of how long it takes to fill the float bowl again with a squirt of gas at a time,then send fuel to the cylinders. Do you try pumping the pedal after it spins over a few times? that would help to get fuel through the carb sooner. the choke will still set due to the fact the spring is still wound when cold. I have an old car also a 69 camaro and using it sporadically I go through the same issues. My son has two other vehicles,both with carbs but one with an aftermarket electric fuel pump. with that set up it will start quicker due to the fact of the constant flow of fuel to the carb as you put your foot on the pedal and open the needle valve. But is it worth switching in your case? If it is only after a long sit,it doesn't sound like much to worry about. Also with a stock pump, if you want to, the fuel pressure should be around 5 pounds if you feel like checking something.
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10-06-2013, 10:34 AM
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#8
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Thanks Joe, I was hoping you would give some input. Does the fuel pump go in the gas tank? If so, I pass on that deal.
I guess we all just want a perfect world, always the correct order from the fast food place, working speakers at the clown, never any computer viruses and gas in my carburetor
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10-06-2013, 11:05 AM
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#9
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Montana Master
Join Date: Mar 2012
Location: Davison
Posts: 786
M.O.C. #12331
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Sounds to me like the fuel is evaporating out of the float bowl after a long sit-possibly the line from the fuel pump to the carb as well. Also might want to check that fuel pump as well-sitting for long periods would not do the diaphragm in the pump well. The pump can be easily checked with a low cost pressure tester. Should be at least 3-1/2 pounds pressure as I recall-and it should hold-not fall. If it does replace the pump. By the way, if you replace it and the pump rods keeps falling, put some grease or Vaseline on it to keep it in place while you are bolting the pump in place.
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10-06-2013, 11:13 AM
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#10
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Where is that pump located anyhow, I might try that, after all it is probably due. and not too pricy I imagine.
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10-06-2013, 11:29 AM
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#11
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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My 1978 Ford did the same thing and I drove it when I needed it like that till I sold it 16 years later. Just figured the bowl was dry and it wanted me to work a little for neglecting it.
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2017 3720 RL, and 2013 HC 343RL
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10-06-2013, 11:31 AM
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#12
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Montana Master
Join Date: Oct 2007
Location: silver creek
Posts: 1,507
M.O.C. #7770
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Aftermarket pumps mount on the frame rail somewhere safe. good to keep it close to the tank as they are better pushers than pullers. Summit would be a good place to look at all the different models of pumps. then get a block off plate to remove the old one and the push rod.
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10-06-2013, 11:37 AM
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#13
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Montana Master
Join Date: Oct 2007
Location: silver creek
Posts: 1,507
M.O.C. #7770
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may have mis-read your post on pump, stock pump is mounted front lower right corner of engine. not a bad job to replace,fuel in and out and two bolts. also do it with a cold engine,push rod has a better chance of staying up,out of the way when replacing pump. If not lube rod with grease to hold in place also on some years there was a bolt on front of engine that gave you access to thread a bolt in to hold rod up. not sure if yours has it
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10-06-2013, 11:44 AM
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#14
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Thanks Joe, you are very knowledgeable Auto mechanics is something I have stayed away from, wanted to keep the little extra space in my brain for the stuff I have to do to make a living
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10-06-2013, 11:44 AM
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#15
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Montana Master
Join Date: Apr 2013
Location: Arroyo City
Posts: 3,110
M.O.C. #13395
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My "'53 Ford will always start after she sets for 6 or 7 months. Have to crank for a bit, but that gets the oil circulating
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10-06-2013, 11:47 AM
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#16
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Quote:
quote:Originally posted by K0LCB
My "'53 Ford will always start after she sets for 6 or 7 months. Have to crank for a bit, but that gets the oil circulating
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I thought they should, thanks.
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10-06-2013, 01:18 PM
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#17
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Montana Master
Join Date: May 2011
Location: Fayetteville
Posts: 4,200
M.O.C. #11401
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Find a Ser sta that still sells fuel without alcohol. Might solve your problem.
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10-06-2013, 01:48 PM
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#18
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Montana Master
Join Date: Oct 2004
Location: Salem
Posts: 7,528
M.O.C. #2283
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Ozz it's an easy problem; get rid of the truck then quit work. Give it a try you will like, no love it.
Lynwood
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10-06-2013, 01:58 PM
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#19
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Quote:
quote:Originally posted by mlh
Ozz it's an easy problem; get rid of the truck then quit work. Give it a try you will like, no love it.
Lynwood
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Oh, this is my old Yeller, bought it in '76 and still drive it on occasion, has a Tommy Lift tailgate on it, saved my Bacon numerous times.
I agree about the retirement deal, just need to hit the lottery so I can live like them Jones' folks
I have antique license plates on it!
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10-06-2013, 02:02 PM
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#20
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Old Yeller:
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