Re: Bucking Slightly at Cruising Speeds
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Home away from home
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Thanks, Don! That line is omly about two years old and came from one of the major suppliers. I put it on before I would've known better to check the ID on the hose. Sorry, should've offered that. Everything on the fuel side is basically new (or rebuilt). The tank is a stainless tank with vented cap, the lines are new, I have a WIX in-line filter before the pump, and bowl-style filter before the carb. The pump is freshly rebuilt, I used the insulators for the pump, bought and installed the fuel pump heat shield. I've really tried to meticulously manage these critical elements.
I just wondered if it was plausible that that line, even if relatively new, might be collapsing when warm. The ID really surprised me, and I would have guessed that might be an issue.
Posted on: Yesterday 23:30
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Joe B.
Greenville, NC 1950 Super Deluxe Eight Touring Sedan, Model 2302-5 327 w/ Ultramatic, 6v+ |
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Re: Bucking Slightly at Cruising Speeds
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Home away from home
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I tend to agree with Don, that is, I'm not sure why vapor locking seems to be such a common issue. My 53 Cavalier does not have this issue.
Do you have something on the line from the pump to the carb to protect it from the heat? You mentioned that the car died after about 25 minutes, but then after using the electric fuel pump it started back up. How did it run after you started it back up? I get this feeling that something is being overlooked. The symptoms sounds similar to those if you didn't have a vented fuel cap. Maybe get a length of fuel line and a jerry can, and bypass the fuel tank and supply line completely to see if that makes a difference. If your car running hot? Was it a hot day this last time it died? My sense if that the vapour lock, if that's what's happening, is a symptom of another issue. There are been several new items added, one of them may be at fault, even though they are new or rebuilt.
Posted on: Today 0:34
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Re: Bucking Slightly at Cruising Speeds
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Home away from home
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If the hose wasn’t made of a material that can handle modern fuels, it’s definitely a possibility that it’s gone bad but easy to remove and check. I have also only ever used stock fuel filters which for mine are the glass bowl type attached to the carburetor although admittedly some have had modern paper elements inside. Although many seem to recommend it, I would never put a filter before the pump..
As for all the vapor lock issues that get reported, I would bet that only a tiny percentage are actually vapor lock! Once we convince ourselves of that diagnosis, we start looking for everything that might cause it rather looking for the actual problem. If, as you say, your fuel system has been rebuilt and the pump has the proper pressure, then be sure it has the insulator sleeves and washers, that the heat shield is mounted over the pump and that the insulator is on the line from the pump to the carburetor. Also be sure that the line is steel or stainless steel, not copper.
Posted on: Today 1:51
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Re: Bucking Slightly at Cruising Speeds
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Home away from home
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The vapor lock issue is intriguing, why does it happen to some cars and not others? Obviously several factors, such as, the fuel itself...ethanol
![]() An electric fuel pump will compensate for the issue, rather than cranking and cranking your engine so the mechanical pump can pull fuel back up from the tank. But why do some cars/owners seem to have continual vapor lock issues, and others don't? Has anyone run a return line back to the fuel tank to prevent vapor lock? To Don's point, how many times is vapor lock thought to be an issue but it's not? Is there a better way to diagnose vapor lock? At what temp is modern fuel generally vaporizing? The fuel line/carburetor would need at least that temp, correct? This should be something that is simple to check. Just noodling while I have a coffee...........
Posted on: Today 9:49
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