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Car will not re-start after a drive - Help.

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Bandaids - Bandaids - Bandaids

We've yet to find the real problem....
 
Vping, I got 5 bucks that says your pump is not pumping so good.
 
But why only hot? How much heat is by the pump. Not much. Could it be the pump itself getting warm & not pumping? Hmmmm. Maybe it is not a car running problem as much as it is a problem with the pump running for 10 minutes. If I run the pump without actually pumping gas for 10 minutes will it hurt the pump?
 
Wait a minute. I thought we were talking about the TD! Good lord, I'm an idiot. LOL! /bcforum/images/%%GRAEMLIN_URL%%/hammer.gif

Ok, ignore the part about the pump getting hot, and probably a few other tidbits.
 
TD is coming up next while I get the '74 on the Road. I am sure that will lead up to a host of new problems & posted.

Any new thoughts then Steve and would you/how do you put an electric fan into a T series. (we can discuss this part later)

It's the '67 GT that is all of a sudden giving me trouble.
 
Steve_S said:
Wait a minute. I thought we were talking about the TD! Good lord, I'm an idiot. LOL! /bcforum/images/%%GRAEMLIN_URL%%/hammer.gif

Ok, ignore the part about the pump getting hot, and probably a few other tidbits.
Click to expand...
I wondered where you were coming from on that Steve - multiple cars do lead to that kind of a misunderstanding.

Vince - Running the pump without a load on it for 10 minutes will heat it up quite a bit, but should not be detrimental to it. Keep feeling it as it runs and if it gets too hot to leave you hand on it, then shut it down and let it cool of some. If you have a long length of 1/4" neoprene tubing, you could run the outlet of the pump back into the tank and let it pump fuel for 10 or 15 minutes. The pump will still heat up, but not as quickly if it is running wide open with no load on it. Note: The pump heating up during this kind of test is NOT the result of no fuel running through it to provide cooling, but rather the result of a much longer duty cycle (the period of time the coil is conducting current in relation to the total on-off cycle of the pump). In normal operation, the time that the pump is off is quite long compared to the amount of time it is off, thus it runs quite cool. The on period of the pump is set by the throw over time for the lower points toggle and is relatively constant whether it pumping fluid or running wide open, while the time the pump is off is determined by how long it takes the volute spring to push the fuel into the float bowl. Under actual pumping that time can be as long as 10 - 15 seconds. When the pump is running wide open with no fuel being pumped the off period can be as short as 50 - 100 milliseconds - not much time to cool between on periods.

After running the pump for a period of time long enough for it to heat up well, reconnect the fuel line and try running the car. Often a pump will fail under load, even though it will run fine when it is running wide open.
Cheers,
 
Thanks David. Knowing you from the TD forum I figured you would have pump input. I'll try tonight to see what I can figure out.
 
You shouldn't need an electric fan on a TD but it can be done. Far easier is to swap the original 4-blade, 2-piece fan with a 6-blade MGB fan.

Incidentally, there were two TDs in our caravan to Utah a few weeks ago. They survived 110-degree temperatures through the desert without overheating.
 
As they should have.
 
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