View topic - Help with '40 DeSoto not starting, please.

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PostPosted: Mon Jul 12, 2010 6:51 pm 
My '40 DeSoto runs well once it starts, but won't "fire off" when starting, as if it's not getting fuel. I can start only if I spray fuel (out of a can) directly into the carb.

Procedure that used to work: turn on electric fuel pump for 10 seconds, slight choke, a few accelerator taps, and it starts instantly. This no longer works. It sounds like it's starved for gas as it turns over well with a strong battery, although it has a fresh tank of premium gas.

1) Should I start by testing outflow of electric fuel pump under the drive door? How strong should it be?
2) Is there a fuel filter somewhere that might need to be cleaned?
3) Or something about the fuel pump, even though the car runs perfectly once it starts?
4) Somewhere test fuel line pressure
5) Other thoughts or ideas?

Any suggestions greatly appreciated. Thanks.

PostPosted: Tue Jul 13, 2010 1:29 am 
Scott, it would not hurt to check all the mentioned items but ...I am thinking accelerator pump is bad. Do you get a good jet of fuel when you push the accel pedal?

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PostPosted: Thu Jul 15, 2010 3:29 pm 
I would also suggest the accelerator pump based on your description. If the car runs well once it starts, then the fuel pump, filter, etc, is probably delivering enough fuel.

It sounds like you are using the mechanical pump after the initial delivery of fuel by the electric pump? Even so, if the car runs fine after startup, then the mechanical pump should be working alright, too.

You could disconnect the fuel line at the carb, (get a can or something to catch the fuel) and run your electric pump and see if you have a strong flow of fuel being delivered to the carb.

Our '53 Olds project suffered the same symptoms as you describe, and we had a bad accelerator pump.

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