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#26 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: So I ran out of gas. I think. Maybe.
Alright, I've taken this ol turd out every weekend since this occurred and put a few miles on it pretty uneventfully. Christmas Day on a stretch of highway it started feeling like I was pulling a heavy load, I was at my destination before I could investigate further, but I did take the gas cap off when I stopped the truck. Truck probably sat for an hour, when I left it fired right up and ran fine the rest of the trip.
Today. I took the truck out for a drive. After I warmed it up with some spirited driving the problem came back full force. Under load in 4th gear the truck stopped accelerating. I reached out and removed the gas cap. No change. I came to a stop. Fuel pressure at the carb was 5.5-6 psi. When I got back on the road it was the same in every gear, it was like I was pulling a super heavy load. I couldn't go above 2,000 rpm. Roughly 45mph. No backfiring, or missing. Just failure to thrive. I limped it home. Tried unplugging the vacuum advance, no change. Checked timing, no change. It will crank, idle, rev, even move around the yard fine. I checked the plugs, they are light tan. Cliffs: Problem came back after 10 mile cruise, again after high rpm romp Not gas cap 7" of fuel in tank 5.5 psi of fuel at carburetor Plugging vacuum advance didn't change anything This sound like anything in particular? Incase it wasn't mentioned earlier the truck has an hei distributor |
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#27 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: So I ran out of gas. I think. Maybe.
It sounds like it is not a fuel issue, so I would think it is ignition related. Does the HEI have a full 12 volts to it? Have you had the cap and rotor off and looked at the advance weights?
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#28 | |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: So I ran out of gas. I think. Maybe.
Quote:
I didn’t consider an issue with the mechanical advance, I’ll inspect that first |
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#29 |
Registered User
Join Date: Feb 2012
Location: pleasant valley--placerville ca
Posts: 3,039
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Re: So I ran out of gas. I think. Maybe.
coil over heating? this a gm hei?
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1961 chevy K10 my build is------------61K10 build |
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#30 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: So I ran out of gas. I think. Maybe.
If it’s not the weights seized up that’s what I’m leaning toward. I couldnt find my exact symptoms by searching for overheating coil issues. Most say they backfire and miss.
I assume I would have to get the coil hot and take an ohm reading? It’s a summit branded HEI. Likely Chiwaneeze. |
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#31 |
Registered User
Join Date: Mar 2010
Location: thomastown mississippi
Posts: 1,261
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Re: So I ran out of gas. I think. Maybe.
To check mechanical advance unhook & plug your vacuum advance & get your timing light out & see if the timing advances by the light when you rev the engine. It should advance outta sight.
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#32 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: So I ran out of gas. I think. Maybe.
Yes sir, it was working when I checked the timing, my thoughts is this may be engine heat related or just intermittent, I may get lucky and find the weights and springs in a rusty mess by taking a look.
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#33 |
Registered User
![]() Join Date: Jan 2015
Location: Tampa, Fl.
Posts: 423
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Re: So I ran out of gas. I think. Maybe.
Depends on what your neighbor looks like...
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#34 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: So I ran out of gas. I think. Maybe.
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#35 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: So I ran out of gas. I think. Maybe.
update:
I had a few hours to mess with it this evening, the advance weights move freely, I had a cap, coil, rotor and module on the shelf. It was none of those things. |
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#36 |
Registered User
Join Date: Oct 2016
Location: san bernardino ca
Posts: 1,611
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Re: So I ran out of gas. I think. Maybe.
Wow, what could be next?
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#37 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: So I ran out of gas. I think. Maybe.
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#38 |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: So I ran out of gas. I think. Maybe.
Progress! It turns out you can have fuel pressure without fuel volume. I found a large amount of silt in the filter, inlet screen on the carb, and in the bowls. Apparently I done a $@!t job of cleaning the tank. I’m assuming this is rust or is this what happens to varnish that gets left behind?
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#39 |
Registered User
Join Date: Oct 2016
Location: san bernardino ca
Posts: 1,611
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Re: So I ran out of gas. I think. Maybe.
Wow, That is dirty.
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#40 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: So I ran out of gas. I think. Maybe.
Looks like rust to me.
__________________
Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#41 |
Senior Member
![]() Join Date: Feb 2010
Location: Lambertville, MI
Posts: 1,860
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Re: So I ran out of gas. I think. Maybe.
Ha, my sisters 72 Chevelle went through this until we installed a new tank. Very fine sediment from rust makes it past most filters as i found out
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#42 |
Moderator
![]() ![]() Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: So I ran out of gas. I think. Maybe.
Ya, you'd need a larger Donaldson or Cat 2 or 3 micron filter to get all that out of the fuel. Also there is more in the tank that will continue to come out over time. Even then over time heavy silt will build up again eventually. I would change the tank and the lines as well. But that's just me.
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Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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#43 | |
Registered User
Join Date: Apr 2012
Location: L.ower A.labama
Posts: 518
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Re: So I ran out of gas. I think. Maybe.
Quote:
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