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Old 03-17-2019, 05:27 PM   #1
jwaldrich
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Default 1940 LaSalle Fuel Starved

1940 322 CI was running sweet when all of a sudden it coughed and died. I've determined that it wasn't getting any fuel so I purchased and installed a rebuilt fuel pump and "no joy".

Poured gas in the carb and she fired right up and dies when the gas is gone.

Disconnected the output line on the new pump, cranked it and no gas getting through the new fuel pump. Car has roughly half a tank so not out of gas.

Bought and installed an electric fuel pump (inline) bypassing the mechanical one. STILL no joy. It isn't getting gas to the carb.

Blew lp air into tank and fuel sprays out of the feel line from the tank. Blew back the other way as well to ensure no blockage.

Ideas?
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Old 03-17-2019, 06:16 PM   #2
Bob C
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Default Re: 1940 LaSalle Fuel Starved

I had a flex line between the fuel pump and metal line come apart inside one time and you could blow back to the tank but not the other way.


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Old 03-17-2019, 08:07 PM   #3
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Default Re: 1940 LaSalle Fuel Starved

Check all fittings for tightness. It might be sucking air instead of gas.
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Old 03-18-2019, 05:00 AM   #4
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Default Re: 1940 LaSalle Fuel Starved

Hole in the pickup tube inside the tank?
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Old 03-18-2019, 07:19 AM   #5
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Default Re: 1940 LaSalle Fuel Starved

you are getting air in the line somewhere between the pump and the gas in your tank.
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Old 03-18-2019, 12:06 PM   #6
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Default Re: 1940 LaSalle Fuel Starved

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Originally Posted by jimTN View Post
you are getting air in the line somewhere between the pump and the gas in your tank.
Will buy a rubber fuel line today to run from the tank to the fuel pump and see what happens.
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Old 03-18-2019, 12:17 PM   #7
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Default Re: 1940 LaSalle Fuel Starved

What kind of electric pump did you buy. I've had the same problem and found the line going into the pump must be lower than the pump. I then put alittle air into the tank to prime the pump. I made a lupe that is about 5" below the pump.Works fine now.
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Old 03-18-2019, 12:24 PM   #8
jwaldrich
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Default Re: 1940 LaSalle Fuel Starved

Quote:
Originally Posted by jimTN View Post
you are getting air in the line somewhere between the pump and the gas in your tank.
Quote:
Originally Posted by Ol' Ron View Post
What kind of electric pump did you buy. I've had the same problem and found the line going into the pump must be lower than the pump. I then put a little air into the tank to prime the pump. I made a lupe that is about 5" below the pump.Works fine now.
I wondered about the elevation of the pump. The line feeding the pump was below the pump. I finally got it to "trickle" but not enough to run the car.

I mounted the pump on the fender well so it was stable. Not quite as high as the tire is tall.
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Old 03-18-2019, 03:33 PM   #9
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Default Re: 1940 LaSalle Fuel Starved

Works best as close to the bottom of the tank as practical.
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Old 03-18-2019, 05:31 PM   #10
Ol' Ron
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Default Re: 1940 LaSalle Fuel Starved

Yep JSeary has it again
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Old 03-18-2019, 09:47 PM   #11
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Default Re: 1940 LaSalle Fuel Starved

Quote:
Originally Posted by jwaldrich View Post
I wondered about the elevation of the pump. The line feeding the pump was below the pump. I finally got it to "trickle" but not enough to run the car.

I mounted the pump on the fender well so it was stable. Not quite as high as the tire is tall.

Mine works well mounted to the rear cross member.
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Old 03-18-2019, 09:50 PM   #12
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Default Re: 1940 LaSalle Fuel Starved

Might want to also replace your fuel line after the tank clean or replacement. Nothing like a fresh line. It's not too expensive if you do it yourself.
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Old 03-18-2019, 10:53 PM   #13
Mike in AZ
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Default Re: 1940 LaSalle Fuel Starved

Plumb a line to the pump from a can of gas. If you get a flow of gas from the pump, then problem is between pump and tank. I hope. Good luck. Mike
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Old 03-18-2019, 10:56 PM   #14
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Default Re: 1940 LaSalle Fuel Starved

Your picture looks familiar, the highway man. Any relation?
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Old 03-19-2019, 01:38 AM   #15
T Scott
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Default Re: 1940 LaSalle Fuel Starved

I was told that with a leaky diaphragm, the laSalle pumps could dump fuel into the crank case. I'm not sure this is the case, but since the bottom half of the pump is a vacuum booster for windshield wipers it is probable that there is no fuel drain to prevent such fuel dump. Frankly, I never inspected my 37 laSalle fuel pump for a drain.

In any event, I installed two Facet low pressure electric fuel pumps, filter and pressure gauge on the frame rail in the engine bay. They are in series with one being a back up.
No problems drawing fuel, no carburetor flooding and easy filter access.
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