Preventing vapor lock - Lateral-g Forums

J-440 · #1 08-25-2018, 05:23 AM

I’ve got a 1/2” vent line from the top of the fill tube exiting through the trunk floor. I’ve also got a fuel pump controller so the pump isn’t going full blast during cruising. Anyone take a temp reading of their fuel rails? Just curious about the differences in iron and aluminum blocks.

dhutton · #2 08-25-2018, 06:04 AM

Quote:

Originally Posted by J-440

I’ve got a 1/2” vent line from the top of the fill tube exiting through the trunk floor. I’ve also got a fuel pump controller so the pump isn’t going full blast during cruising. Anyone take a temp reading of their fuel rails? Just curious about the differences in iron and aluminum blocks.

What cutback rpm did you set that Aeromotive controller for? What is the reduced pump voltage?

Don

**GregWeld** · #3 08-25-2018, 06:19 AM

One year on the HOF tour we had a Mustang with an externally mounted fuel pump -- fuel would get hot and the car would start acting up or leave her stranded...

Someone suggested filling the truck with bags of ice until a real repair could be done. BINGO --- problem solved.

What am I saying here?? It was all about the pump overheating.... Period. Nothing else wrong with the system.

J-440 · #4 08-25-2018, 06:59 AM

The controller is set to go full blast at 3500rpm. Voltage is fine. Forgot to mention that the pump temp was at 175 degrees when everything else was at 250.

dhutton · #5 08-25-2018, 09:45 AM

Quote:

Originally Posted by J-440

The controller is set to go full blast at 3500rpm. Voltage is fine. Forgot to mention that the pump temp was at 175 degrees when everything else was at 250.

So you don’t know what your reduced voltage is? Haven’t you measured it?

If the heat sunk exterior of the pump is 175 you can bet the internal pump components are considerably hotter. If I had to guess I would say in excess of 300 degrees. This is based on 35 years of hardware design and countless thermal analyses and calculations....

Don

J-440 · #6 08-25-2018, 11:11 AM

Voltage is right at 9. I used the instructions on the Aeromotive website.

dhutton · #7 08-25-2018, 12:29 PM

Pretty sure that pump is cooking your fuel if the external temperature is 175 degrees. What is the temperature of the fuel lines connections in and out of the pump? If the output side is much higher than the input side then that would show it is heating the fuel...

Don

Zspoiler · #8 08-26-2018, 10:00 PM

Have you tried a heat shield under the fuel injection?