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1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.


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Garnier
Anonymous Poster
kfunnyman@yahoo.com

May 26, 2009, 8:06 AM

Post #1 of 12 (4822 views)
  post locked   1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.  

Hi.

I have a 1948 Desoto, flathead 6, all original parts. 6 volt charging system, etc. Everythings been rebuilt from carb, to a valve job. The other day the car just died as though I ran out of gas. It sputtered and died. A few minutes later it started up fine. I drove approx. 100 yards and it died again. After repeating the process several times, I got it home and let it rest overnight. This morning the same thing: It started fine. Backed out of the driveway fine. I drove it may 50 yards, it died. HELP! :-) Thanks.

(This post was edited by Tom Greenleaf on May 29, 2009, 1:39 AM)
Attachments: attachment icon car1.jpg (16.4 KB)


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

May 26, 2009, 6:12 PM

Post #2 of 12 (4814 views)
  post locked   Re: 1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.  

Garnier; Need to know if it is losing spark or fuel when this happens.
Loren
SW Washington


Garnier
Anonymous Poster
kfunnyman@yahoo.com

May 26, 2009, 8:20 PM

Post #3 of 12 (4812 views)
  post locked   Re: 1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.  

HI, Loren

I believe it's losing spark. I checked the fuel filter and that was clear. Since it starts up right away I assume the fuel pump is working properly. Thanks.


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

May 27, 2009, 1:59 PM

Post #4 of 12 (4801 views)
  post locked   Re: 1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.  

Check points, first. Could be as simple as a faulty condensor. If the points are a blueish color, they are getting hot. If you need specs for point dwell and timing, let me know. I'm sure I can come up with it. Could also be faulty coil, coil wire, distributor cap, ect., so be sure to check all of it. Pretty sure we can rule out crank sensor or injector pulse?Wink
Loren
SW Washington


Garnier
Anonymous Poster
kfunnyman@yahoo.com

Jun 11, 2009, 9:31 PM

Post #5 of 12 (4760 views)
  post locked   Re: 1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.  

Hi, Loren.

Checked all the electrical stuff. Everything there is fine. Once again, it idles fine, cuts off like it ran out of gas only when driving. Perhaps I was wrong. It wasn't losing spark. Thanks.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 12, 2009, 7:50 AM

Post #6 of 12 (4756 views)
  post locked   Re: 1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.  

Take fuel pressure. Guess only 4-6 psi. The alcohol in many fuels we buy is hard on OE stuff from before using that. A kit may be avalable to do that yourself on this car. Check with either NAPA or a DeSoto car club might be a lot of help,

T

PS: You could use an electric fuel pump but I don't know of any for 6v systemsUnsure


T



Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Jun 12, 2009, 4:17 PM

Post #7 of 12 (4746 views)
  post locked   Re: 1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.  

Garnier; Is the fuel filter a clear type? Is it empty when it dies? Does the engine seem flooded when it dies? So many possibilities.Unsure Weak fuel pump, needle/seat/float problem, ect. Check your choke operation. Is it opening fully when you push in the choke? Can you keep it running by giving it more choke? (I'm assuming it is a manual choke, of course)
Loren
SW Washington


Garnier
Anonymous Poster
kfunnyman@yahoo.com

Jun 18, 2009, 1:29 PM

Post #8 of 12 (4723 views)
  post locked   Re: 1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.  

Hey Loren & Tom.

Thanks for your advice. After testing everything we could, it turned out to be the fuel pump. At least for now. :-) In any case, I'm back on the road and HAPPY!


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 19, 2009, 12:38 PM

Post #9 of 12 (4714 views)
  post locked   Re: 1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.  

Thanks for the follow up - many folks don't and these archived post/threads can help,

T



e.g.
New User

Feb 27, 2010, 1:09 AM

Post #10 of 12 (4281 views)
  post locked   post icon Re: 1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.  

Hi I presently own the same car,I went as far as to replacing the gas line,fuel tank,fuel pump I bought and rebuilted the carberator."none of this worked" Listen your problem is right in front of your nose .Are you ready for the answer.Follow your fuel line from your carberator to a braided line on the passenger side of the fender.Just disconnect that small piece of gas line,replace it with a rubber line and use 2 small clamps.Bingo your problem just disappeared. The problem you had is that small piece of line became a 1 way valve while the car is running.If you are having a problem locating the hose,feel free and drop me an email.


Personal info deleted


(This post was edited by Hammer Time on Feb 27, 2010, 6:40 AM)


jharring10
New User

Aug 18, 2010, 8:07 PM

Post #11 of 12 (3991 views)
  post locked   Re: 1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.  


In Reply To
Hi I presently own the same car,I went as far as to replacing the gas line,fuel tank,fuel pump I bought and rebuilted the carberator."none of this worked" Listen your problem is right in front of your nose .Are you ready for the answer.Follow your fuel line from your carberator to a braided line on the passenger side of the fender.Just disconnect that small piece of gas line,replace it with a rubber line and use 2 small clamps.Bingo your problem just disappeared. The problem you had is that small piece of line became a 1 way valve while the car is running.If you are having a problem locating the hose,feel free and drop me an email.


Personal info deleted


I am having a very similar problem. In 2008, I used my 1948 DeSoto in a wedding for a family member. She ran flawless prior to 2008. The wedding was around 30 miles away and I hit some heavy traffic prior to hitting the highway so I pushed her pretty hard around 75mph to make it in time but she ran fine. After leaving the church, she started sputtering and loss of power once I got on the highway. She stayed running and I could rev her up when I pushed in the clutch (semi automatic) but never stalled. However, when I released the clutch she would bog down again. I luckily made it to the hall and the wedding was a success. I thought that the gas might be bad as this was her fight time out on the road that year. I filed her up, and then headed home after the event was over. I got on the highway and the same problem occurred. I then decided to take back roads with no issues driving under 40mph. I took her to the lake last Labor Day weekend via back roads (about a 1 1/2 ride). She was ok for about 30-45 minutes then she started to act up again. I topped her off at the next station and the problem did not improve, it may have even gotten a little worse but I did make it. I left her in the garage at my lake house for the long weekend. I headed back (after a few days) without gassing up at all (had almost a full tank) and the car ran perfect all the way home. This is my theory. I think that ethanol in the new gas may have cleaned or loosened any sludge in the tank after 60 plus years. When the vehicle was sitting for the weekend, any dirt has settled to the bottom of the tank but when I gassed up it stirred and disrupted all the junk in the tank. This fall I was going to drain out all the gas and replace the tank. Does this make sense? I would appreciate any feedback.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 19, 2010, 2:49 AM

Post #12 of 12 (3980 views)
  post locked   Re: 1948 Desoto starts fine. Sputters and dies in drive after a few minutes. Starts fine again.  

This thread is over a year old. If you have a question, please start a new thread for it.



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