Hi, was riding my 62 valiant signet last night. after i got up on the freeway (rush hour DC) the engine began to run rough. cut out at idle, but restarted. at the next stop at idle the engine cut off and would not restart. flooded when i tried to restart. eventually got it running again but now need to solve the problem.

the engine bliped up and down in short cycles just before dying. my buddy john opined that the carb float was hanging up with bubbles in the fuel line pushing it down, or a vapor lock issue, or the two together. i did note that the fuel line is up against a radiator hose, which could heat the fuel up en route to the carburetor (a carter single barrel).

there was some slight seepage of fuel around the carb base, but really very little, just a touch moist not a real macho leak.

going to be troubleshooting this weekend and was hoping some wise heads could share some thoughts on what to pursue. could the mixture valve be too rich? is the fuel too hot?

we won't talk about the pinhole leak in the radiator i discovered when i raised the hood that i spent $400 getting overhauled last summer.

thanks for any tips!

cshunley

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cs hunley

The original '62 fuel line routing scheme was one of the more problematic ones from a heat perspective. Do the fuel line mod to get rid of problems from this area.

Is the manifold heat control "heat riser" valve in your exhaust manifold working correctly, or is it stuck?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Route the fuel line over the valve cover using fuel injection hose and most of your hot starting/running problems will go away. Throw that metal line away, they are notorious for heating up a hurry and boiling the gasoline inside of them.

Slantsix Dan has a link describing this method. Funny however, that most trucks came from the factory with the fuel line routed over the valve cover. Only on cars did they have the fuel line going around the devil's elbow to get to the carb.

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

What was the weather like the day you had trouble? Many gas stations are still serving up the winter gas formulation this time of year (higher vapor pressure) which is real problematic on slant sixes when you encounter the first warm days of the year.

D/W

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If it ain't broke, fix it!

You sure about that?

D/W

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If it ain't broke, fix it!

What else did you see it on? A van? Industrial application?

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

I'm asking you, Jeb!

...are you sure that all trucks with the slant six came the way that you describe

D/W

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If it ain't broke, fix it!

I have seen a 68, 79, and 82 Dodge pickups with slant sixes that have the fuel line going over the valve cover.

Let me rephrase that, most of the pickups had the line going over the valve cover, not all.

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

thanks for the tips. i will work on the car in the next few days and circle back with a report. i believe the exhaust valve is working ok but i will check. gosh i hope i don't have to swap manifolds AGAIN. and i will look at moving the fuel line around to keep the fuel cool. it was a hot day (relatively speaking). thanks again! cshunley

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cs hunley

I didn't say you were wrong, Jeb. I honestly don't know, I've never owned a /6 pickup (though I've seen and worked on a few, but I don't recall how the fuel line was routed). I was asking you if you were sure they were all that way!

D/W

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If it ain't broke, fix it!

Here is a pic of the engine in my D-150. The fuel line is right behind the PCV valve.



I thought your blue truck had a slant in it?

The other three slant pickups I have seen have had the same fuel line arrangement

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

My '82 D150 also had the metal fuel line up and over the valve cover as pictured above.

shoot, now i have to go get my flash light and go look.

sb

yep, right over the top of the valve cover.

1982 D150

sb