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Old 03-15-2011, 11:11 PM
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Someone Else's Truck Project.

Greetings,

I have purchased a 1982 Chevy K10 Pickup 4x4, single cab, it was converted from diesel engine to gas (by a complete moron). Still having a problem with missing vapor can, high pressure in gas tanks and overflowing/spilling of gas (1gal. or more) while vehicle has been sitting (warm). This is still happening after replacing both gas tanks and adding key type caps. Latest occurance was immediately after topping off engine oil. Tanks have 3 lines each. Any ideas ?


Thanks.

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Old 03-16-2011, 04:51 AM
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Quote:
Originally Posted by Cyberats
Greetings,

I have purchased a 1982 Chevy K10 Pickup 4x4, single cab, it was converted from diesel engine to gas (by a complete moron). Still having a problem with missing vapor can, high pressure in gas tanks and overflowing/spilling of gas (1gal. or more) while vehicle has been sitting (warm). This is still happening after replacing both gas tanks and adding key type caps. Latest occurance was immediately after topping off engine oil. Tanks have 3 lines each. Any ideas ?


Thanks.
2 questions,

Topping off engine oil? is that right?
OK, 3. Where is it leaking from?
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Old 03-16-2011, 06:19 PM
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Hi,

Have a similar vintage truck. I am assuming it is spewing fuel out of the fuel cap and when you're filling up.... If so.....

Here is what you should do.

1. Look under the truck (on your back, looking up to the tank. pick one)
2. Identify the three lines to each tank.
3. One of the lines will be larger in diameter than the other two. This is your fuel supply line.
4. The other two lines are for fuel vent and fuel return.


The fuel vent line should be traceable to the front of the truck, near the radiator support. If it is "kinked" then you need to cut it at the kink and then vent it.

The other line (fuel return) was used for the diesel lift pump/fuel pump and was intended to take excess pumped fuel and return to the tank. (Gas engines in CA have the same set up.) It can be used as a "vent" as well. Just find out where it was plugged.

(Likely "moron" plugged it near the fuel pump near the #2 cylinder of the engine.)

You can simply "vent" it to a charcoal canister or some other convenient "filter" that will eliminate water contamination. LMC Truck also has pre-bent, full lines that you can replace if your lines are a complete loss.

One last tip.... Ethanol blended gas (here in CA) is murder on the old rubber lines. Summit Racing has blue silicone based hose that works as a great replacement. (I did this on my truck.)

Cheers,
Matt
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Old 03-19-2011, 12:33 PM
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msilveira

Thanks I will look for those lines, I am in Colorado now, changed scenery, yes I leaned out carb too. So I don't get CA crap anymore, hoping never to go back there. We get 85 octane here at the pump, which is supposed to ignite faster ?
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Old 03-19-2011, 12:37 PM
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sqzbox

Engine Oil - I know most mechanics say never to go over the full line, truth is - one quart over full (in my previous 5.0L V8 car) got me 13/20 mpg, which is 1 mpg off the factory tested ad.
It is leaking from the cap itself, the gas tank has a vent line.
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Old 03-20-2011, 07:02 AM
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What you are saying seems to make no sense. It spilled a gallon of gas because you added a quart of oil?
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Old 03-20-2011, 11:50 AM
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Quote:
Originally Posted by willowbilly3
What you are saying seems to make no sense. It spilled a gallon of gas because you added a quart of oil?
You get that on here. Sometimes you have to read between the lines. I assumed he was talking about the fuel but never got a response after asking about it so.........
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Old 04-20-2011, 09:44 PM
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Weird Coincidence Maybe ?

I added engine oil after vehicle been sitting for an hour or so, I slammed the hood and gas started spilling around the edges of cap in right tank only (dual tanks).
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Old 04-20-2011, 09:50 PM
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Thanks Again Matt

I believe in the discipline of steel, I will be looking for the metal upgrade.
As I found out, they are blending 10% ethanol in gasoline here too.
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