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Joined: Nov 2008
Posts: 58
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2008
Posts: 58 |
Talking about stumbling,when my 28 climbs a hill it stumbles. I advance the spark, no good ,I retard the spark, no good, Checked the timing with a time light, right on. Check the advance, right on. Start great, runs well on level. Don't know where to go next. thanks trooper
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Joined: Feb 2009
Posts: 597
Oil Can Mechanic
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Oil Can Mechanic
Joined: Feb 2009
Posts: 597 |
old rule I once read said if you think it is electrical, it will be fuel and if you think it is a fuel problem, then look at the electrical. That said,it does sound like a fuel problem. i would check the fuel level in the carb (don't ask me how, i just had the same conundrum. as well in my search for my problem with the vacuum tanks, there was mention on some web site of issues with it while on a hill if not working correctly.
It's not how fast you can go, but how good you look at 20 MPH.
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Joined: Nov 2008
Posts: 58
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2008
Posts: 58 |
Are the manifold Compression fittings available? trooper
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
Not used on 4-cylinder.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Nov 2008
Posts: 58
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2008
Posts: 58 |
My vac fuel pump was rebuilt last year but I noticed a slight leak at the shut off valve.My Carb was rebuilt.MyDistributor was cleaned and re-timed.Fuel is fresh.Vac is about 16-17,a slight waver. trooper
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Joined: Nov 2008
Posts: 58
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2008
Posts: 58 |
Chevradioman: I.m a little confused. Not used on 4 cyl. The 28 Repair manual kind a describes my problem to a t.Pg180 .the must be available somewhere? thanks trooper
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Joined: Dec 2001
Posts: 11,162
ChatMaster - 10,000
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ChatMaster - 10,000
Joined: Dec 2001
Posts: 11,162 |
I'm kinda of the opinion that Ray was talking about a modern Tubing Compression Fitting , one that connects tubing to a device, or used as a union that uses compression ferrel rings and nuts, rather than a flare in the tubing and a flare nut. The Compression fitting mentioned by Trooper is actually a vacuum compression valve fitting that is screwed into the Intake of a Chevy four cylinder to supply vacuum to the vacuum fuel pump.
Life's a long winding trail, love Jesus and ride a good horse!
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Joined: Nov 2008
Posts: 58
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2008
Posts: 58 |
I'll refresh the question. Are there COMPRESSION COUPLING VALVE ASSEMBLY available anywhere? Any help would be appreiated. thanks trooper
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
Are these hills long or just any hill? The reason I ask is that it is common for people to keep pushing down on the accelerator pedal when the speed begins to drop. If you do that on a long upgrade with a vacuum fuel pump you will run of of fuel to the carburetor. If you only push just enough to keep the engine pulling you should not run out of fuel. Downshifting also helps maintain sufficient vacuum. FYI the vacuum windshield wiper has the same problem.
Now before you all conclude that the vacuum fuel pump is the problem, let me tell you that I still use vacuum fuel pumps on all my '28 Chevys. I have just learned that when climbing mountains (or long hills) to not mash the foot feed to the floor. It is also a good idea to check for vacuum leaks.
How Sweet the roar of a Chevy four!
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Joined: Nov 2008
Posts: 58
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2008
Posts: 58 |
Chipper: Thank you for your help.. Eastern Connecticut has a small roll to the land. I would say the slope or hill is approximately a 15 degree and about 200 feet.My compression runs from low 65psi to 70 psi. thanks trooper
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