Gas sender vent question

S

soonersace

Member
I have a 34 ford that has a 36 ford fuel sender that goes to a more traditional gauge.

I’m sure the sender is dead- I took the gauge to the back and wired direct with proper ground- no dice. Wired the new sender and played with the float level and yup it works.

My question- the original sender has an air vent. The replacement does not. Do I need the vent? Was the vent added?

I ordered the same part number from
Bob Drake.

Do I replace my current plate with the vent with the new sender plate?

Thank you in advance.

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For your set up to function you must provide venting. If your tank is a '34, neither it or its filler neck are vented. You must, therefore, use a vented gas cap. Given the position of the gas cap relative to the '34 tank, expect gas spillage when rounding corners with 3/4 of a tank or more of gasoline.
 
DavidG said:
For your set up to function you must provide venting. If your tank is a '34, neither it or its filler neck are vented. You must, therefore, use a vented gas cap. Given the position of the gas cap relative to the '34 tank, expect gas spillage when rounding corners with 3/4 of a tank or more of gasoline.
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Is this a vented gas cap? This seems to be upgraded with a new tank.

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I'm not familiar with your specific situation, but in other tanks with that type of vent, the other end of the tube that you have fitted to the sender must be secured higher than your fuel filler cap. Otherwise when you're topping off at the gas station there will be gas exiting the tube. You obviously need to make sure that the tube and vent connection is tight.
 
It doesn't look to be vented.
If you have gas in the tank and your fuel line is connected at the carb, you can test it by putting the gas cap on and blowing into the vent tube. Blow as hard as you can for about 30 seconds, if it keeps pressure, the cap is not vented.
 
Here is what the 36-40 correct vented cap looks like on the underside.It will interchange with a 32-35 gas cap.
 

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From your photo of your existing, bad, sender it appears you have a vent tube between the two electrical wires. The vent at this location will allow you to use an original unvented cap and prevent fuel from escaping from the cap. Without a vent on the tank itself refueling can become bother some since the trapped air in the tank will want to burb out and bring fuel with it.
 
Terry said:
From your photo of your existing, bad, sender it appears you have a vent tube between the two electrical wires. The vent at this location will allow you to use an original unvented cap and prevent fuel from escaping from the cap. Without a vent on the tank itself refueling can become bother some since the trapped air in the tank will want to burb out and bring fuel with it.
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So I’m thinking I’ll modify the new sender with the vent tube. I thought I could switch it-but the sender is riveted to the top. I’ll drill a hole-add some tubing and probably do some solder or jb weld to attach it. My current bad one seems to be soldered.


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DO NOT blow into a 32-35? (not sure when last hydrostatic gauge was) with the stock hydrostatic gauge or you will force the VERY CORROSSIVE Indicator fluid out of the gauge and ruin everything it touches. There is an air line that goes from the "sender"/pick up to the gauge. This unit has a built in vent.
 
Does the Drake sender attach directly to the tank or is a adapter plate used,
I would like to change my 35 to a 36 gauge.
 
Someone's not thinking safety here.
Solder -- heat--- gas fumes.............

You won't have to worry about venting the tank....................
 
Sheldon,


When you state that the vented and non-vented caps interchange, please elaborate as using a vented cap on a '32-'34 vehicle with an in-cab tank with an in-cab filler opening is downright dangerous, even if you like gasoline fumes.:)
 
DavidG said:
Sheldon,


When you state that the vented and non-vented caps interchange, please elaborate as using a vented cap on a '32-'34 vehicle with an in-cab tank with an in-cab filler opening is downright dangerous, even if you like gasoline fumes.:)
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David, When I replaced the 35 hydrostatic sending unit (in a 35 I once owned)with a Drake 36 and later electric sending unit I used a 36 vented gas cap. I also replaced the dash unit with a 36 electric unit. The OP replaced (or it had already been replaced)the 34 hydrostatic sender with a Drake electric so the car has had the orig gauge replaced or modified?.Terry brought to my attention of the fact that a vent had been adapted to the Drake sender which I overlooked.
 
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nelsb01 said:
Someone's not thinking safety here.
Solder -- heat--- gas fumes.............

You won't have to worry about venting the tank....................
Click to expand...


I won’t do it anywhere near the gas tank- I’ll put it in AFTER I solder in the vent.


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V8guy said:
Does the Drake sender attach directly to the tank or is a adapter plate used,
I would like to change my 35 to a 36 gauge.
Click to expand...


I think I have a 35 gas tank so mine fits right in. I also have an aftermarket non hydrostatic modern style gas gauge.


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