fuel pump pressure

bumblebee · Sep 18, 2018

I want to replace the fuel pump on a 6cyl 265 ci Chrysler industrial flat head. Parts guy said that I need to know what the fuel pump pressure is cause he has two pumps and is not sure which is the correct one. Anyone know what the pressure is for this engine? Is it even an issue? Thanks for any info you guys have.

J. Schwiebert · Sep 18, 2018

Are you replacing the pump with an electric pump?

bumblebee · Sep 18, 2018

No, I am not wanting an electric pump.

Hobo,NC · Sep 18, 2018

3 on the low side 6 on the high side... You will be safe I would not want much if any more..

Duner Wi · Sep 18, 2018

Manual for 265 Cu in industrial says pumps are AC or Carter
but both make 3 1/2 to 4 1/2 lbs.

Bob M · Sep 18, 2018

Most likely want the lowest pressure pump you can get - around 2 - 3 psi max.

All the pump must do is lift fuel and deliver it to the carburetor. Any pressure above 4 or so at the carb inlet is likely to overwhelm the float valve and cause the carburetor to flood.

FWIW we had the same Chrysler flathead in an irrigation pump. It had no fuel pump. Rather fuel flowed by gravity from a tank mounted only about 12" higher than the carb inlet.

Texasmark1 · Sep 19, 2018

3 is a good average number. Get a variable and set it to what works. 3 is mid range on them and I never had a problem with them....even used them on my outboard motor.

fuel pump pressure

bumblebee

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J. Schwiebert

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bumblebee

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Hobo,NC

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Duner Wi

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Bob M

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Texasmark1

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