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Old 04-24-2010, 11:10 PM   #1
crm318
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My truck only starts with starting fluid

Recently, after a bit of driving, my truck wont start and will only turn over. After a 1 hour of sitting, it starts. I look down in the carb and the its getting fuel. I took the carb apart (qjet) and everything was clean. I also replaced the fuel pump and filter just to be sure. I still does the same thing. I can take a can of starting fluid and spray about 3 sprays in each barrel and it will start up. What could this be?
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1972 Cheyenne
Chevrolet red and white
357ci, Vortec heads,
GM Performance high rise intake,
Comp 268H .454/.454 218/218 110 LSA
Quadrajet carb, Flowtech headers, 2.25 40 series
HEI, Curve kit, TH 350, 3.07 gears
275/60/15s on 15x8 rallies

Last edited by crm318; 04-24-2010 at 11:11 PM.
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Old 04-25-2010, 12:47 AM   #2
Sublvr72
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Re: My truck only starts with starting fluid

do you have a see through fuel filter? See if the gas is staying in there, if not it's draining back to the tank which could be a damaged fuel hose or line letting air into the system which allows the fuel to drain back to the tank.
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Old 04-25-2010, 01:03 AM   #3
72lb4x4
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Re: My truck only starts with starting fluid

This may be a dumb suggestion, but have you tried removing the gas cap when it won't start?
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Old 04-25-2010, 03:24 PM   #4
crm318
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Re: My truck only starts with starting fluid

I have a see through filter and it is full of gas. I can work the throttle and see and hear gas squirting in the venturis. I did also removed the gas cap. A mechanic buddy of mine suggested that the coil might be going out and that it has a weak spark, that is why it will only crank with the starting fluid.
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1972 Cheyenne
Chevrolet red and white
357ci, Vortec heads,
GM Performance high rise intake,
Comp 268H .454/.454 218/218 110 LSA
Quadrajet carb, Flowtech headers, 2.25 40 series
HEI, Curve kit, TH 350, 3.07 gears
275/60/15s on 15x8 rallies
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Old 04-25-2010, 04:18 PM   #5
70jnktrk
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Thumbs up Re: My truck only starts with starting fluid

vapor lock???
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Old 04-25-2010, 05:50 PM   #6
QKENUF4U
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Re: My truck only starts with starting fluid

starting fluid starts tell me its a fuel delivery problem......
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Old 04-26-2010, 02:14 AM   #7
crm318
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Re: My truck only starts with starting fluid

When I work the throttle with my hand, I can see down the carb and see full squirts of fuel shooting in. The see through filter is full and I just put on a new fuel pump. Fuel is atleast getting to the throttle blades. Also, when it is acting up, the motor turns over as if the hot wire is disconnected and not like when it is struggling to start. Im starting to suspect the ignition.
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1972 Cheyenne
Chevrolet red and white
357ci, Vortec heads,
GM Performance high rise intake,
Comp 268H .454/.454 218/218 110 LSA
Quadrajet carb, Flowtech headers, 2.25 40 series
HEI, Curve kit, TH 350, 3.07 gears
275/60/15s on 15x8 rallies
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Old 04-26-2010, 07:29 AM   #8
wHATANERD
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Re: My truck only starts with starting fluid

I'de Check the timing.
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Old 04-26-2010, 07:46 AM   #9
srea76
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Re: My truck only starts with starting fluid

trash in carb or water in fuel? Can you keep misting in starting fluid in and keep it running with starter fluid?
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Old 04-26-2010, 08:00 AM   #10
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Re: My truck only starts with starting fluid

Quote:
Originally Posted by 70jnktrk View Post
vapor lock???
Quote:
Originally Posted by QKENUF4U View Post
starting fluid starts tell me its a fuel delivery problem......
is there a heat plate under tha carb??

do you have an HEI if you do?? it could be the module...the extra heat while sitting still maybe causeing it to act up if its that then its ony a matter of time before it goes completely
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Old 04-26-2010, 01:13 PM   #11
crm318
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Re: My truck only starts with starting fluid

Once I have it running, it runs perfectly and the starting fluid will only bog it down. Im going to have the module checked. The timing is set a 12 degrees and hasnt moved.
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1972 Cheyenne
Chevrolet red and white
357ci, Vortec heads,
GM Performance high rise intake,
Comp 268H .454/.454 218/218 110 LSA
Quadrajet carb, Flowtech headers, 2.25 40 series
HEI, Curve kit, TH 350, 3.07 gears
275/60/15s on 15x8 rallies
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Old 04-26-2010, 04:49 PM   #12
68gmsee
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Re: My truck only starts with starting fluid

They way you describe it is a classic example of carb flooding. Qjets were notorious for leaking fluid from the internal plugs. (see pic)

The reason it starts with starter fluid is because of it's combustibility.

from this site: http://www.carcraft.com/howto/57178/photo_12.html

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