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modirt 
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Joined: 18 Jul 2018
Location: Missouri
Points: 8672
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 Topic: Engine stalling and losing power under load
Posted: 16 Oct 2019 at 12:52pm |
So cruised the hay monster down the road the other day to deliver some hay bales. Getting there was mostly downhill. We just rolled along.
She will start and run fine at idle or in the field under almost no load....but normally, that is running about 2,000 rpm on a level field.....or in 1st gear......there is almost no torque load on the gentle slopes. She handles all that fine.
So coming back from the hay delivery, with engine running somewhere between 1500 and 2000 rpm.......when she started up the hill in 2nd gear, as the torque load increased going up the hill, she started pulling down......would stall, cough.....I would then pump the gas and she might pick up......then catch and start pulling again.....that repeated all the way up the hill....and not a steep one at that.....just a 1/4 mile grade of about 5% or so.
Last hill, I put the pedal to the metal and had her cranking up to about 3000 rpm (guess.....cheap tach I put on is not working)......she pulled right on up and over.
So where should I start looking to correct this stall under load condition?
I had the carb rebuilt a few months back. Fresh 91 octane ethanol free gas and new fuel filters.
BTW, engine is a 318 chrysler.
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weiner
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Joined: 19 May 2012
Location: Cadillac, Mi.
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Posted: 16 Oct 2019 at 1:22pm |
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A Chevy probably went down that road just before and that 318 couldn`t stand the smell. (sorry, couldn`t resist)
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Real heros wear dogtags, not capes.
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
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Posted: 16 Oct 2019 at 1:36pm |
maybe plugged fuel filter ? Had a truck, cruised fine on the level but going up a hill, she would lose power, 'play with pedal' to get up teh hil, once level....it was OK... New fuel filter( under driver's side of cab) cured that..
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3 D-14s,A-C forklift, B-112
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Tbone95
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Location: Michigan
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Posted: 16 Oct 2019 at 1:52pm |
 weiner wrote:
A Chevy probably went down that road just before and that 318 couldn`t stand the smell. (sorry, couldn`t resist) |
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Grayray
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Joined: 12 Sep 2009
Location: Ambridge PA
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Posted: 16 Oct 2019 at 1:54pm |
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I agree with Jay. It's not getting enough fuel. Most likely the filter. If not, look for some other restriction in the fuel system.
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modirt
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Joined: 18 Jul 2018
Location: Missouri
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Posted: 16 Oct 2019 at 2:38pm |
This contraption has two fuel filters.....one that runs from the tank to the fuel pump (which is mounted on the engine) and another between the fuel pump and carb. Both are new. But if that were the case, I'd think it would have trouble getting up to a high level of rpm's and stay there.
This 318 has a Carter BBD 2 barrel carb on it, and that has an accelerator pump to provide a fuel boost under a sudden load (like when you pump the gas). Not sure how to test if that is working....or not. I suppose if the port is clogged that could do it. (I didn't put the carb kit in but the guy who did knows his stuff, so I doubt that is the issue)
I suppose there are also float settings, etc, and the carb was only bench set and has not been adjusted on the engine and running.
But if any of that is the case, I'm not the guy who needs to be dicking with it. I'd likely screw it up more than it already is.
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LouSWPA
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Joined: 11 Sep 2009
Location: Clinton, Pa
Points: 25058
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Posted: 16 Oct 2019 at 3:37pm |
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well, I'm going to go against the grain here. If it runs fine at higher RPM, and not so fine at lower, I would suspect a leak in the intake after the carb somewhere. Running really lean at low RPM, jockey the gas pedal and it picks up. at higher RPM the extra air from the leak is less significant compared to the extra fuel it is getting.
drive it around for awhile at low RPM, and then pull the plugs. They will tell you if you are running lean at low rpm.
Of course, replacing the fuel filter is a quick and cheap first step!
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I am still confident of this;
I will see the goodness of the Lord in the land of the living.
Wait for the Lord;
be strong and take heart and wait for the Lord. Ps 27
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LouSWPA
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Posted: 16 Oct 2019 at 3:41pm |
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well, I didn't read your last post, before I answered. Now I am even more convinced its likely a vac leak, cracked manifold, open vac port, worn gaskets, or a rotted vac hose, etc
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I am still confident of this;
I will see the goodness of the Lord in the land of the living.
Wait for the Lord;
be strong and take heart and wait for the Lord. Ps 27
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DMiller
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Location: Hermann, Mo
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Posted: 16 Oct 2019 at 3:59pm |
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Check the output pressure on the fuel pump, should be making 4-6 lbs, suction should be well over 15" vacuum. Diaphragms on the old engines fuel pumps do NOT like Corn Gas.
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shameless dude
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Joined: 10 Apr 2017
Location: east NE
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Posted: 16 Oct 2019 at 11:01pm |
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I had one of them engines, and for several days when ever climbing a hill, it too would stall out, it got worse as the days went by, found out it was a fuel pump going out, replaced that and all was well again!
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