what happends if?

[mexlokote]

what happends if my fuel seding unit has the frame ground disconnected?


right now i changed my gas tank and my truck used to start right up before i changed the fuel tank, now it wont start, i checked and im not getting has in the carb,
my old fuel tank had frame ground disconnected too,
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[Keckdl]

Is your sending unit getting power?
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[mexlokote]

i dnt know? is there a way to check?
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[74sqrbdy]

The ground wire for your sending unit only has to do with your fuel gauge, not fuel to the engine. Check to see if you have any kinked fuel lines and that they are connected properly to the fuel sender. If they look good I would use starting fluid to get the engine running and that will help prime the fuel pump. Good luck!

[Keckdl]

With a multimeter. Hatzie posted wiring diagrams at http://67-72chevytrucks.com/vboard/s...d.php?t=545416 and it has helped me a lot
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[mexlokote]

i had this happened to me once and i changed the fuel filter and it worked but it has new filter i might havr to check it
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[Keckdl]

If it doesn't power the sending unit can you cyphen purl out of the line to your fuel pump?
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[74sqrbdy]

Is your fuel pump in the gas tank or mounted on the engine?

[mexlokote]

on engine
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[74sqrbdy]

Then the engine should run if you have the fuel lines conected properly. Try the starting fluid and see if that primes the engine.

[mexlokote]

earlier i used starting fluid and it turned on for a few seconds then shutt off and i tried to statt it without starting fluid and would start up only turns over like if it had no gas
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[74sqrbdy]

You might try to keep it running with the starting fluid for 5 to 10 seconds. That should be enough time to get the air out of the lines. If that is not it then I would look at your connections again. If your fuel tank sender has two fuel hoses going to it could you have reversed them? One of them is a vent and the other is the supply for the fuel pump. If the nipples are two different sizes the larger one goes to the fuel pump and the smaller one is the vent.

[mexlokote]

maybe thats it, i will have to check tomorrow because i unhooked the fuel line from the fuel pump and no gas came out, it was dry
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[motornut]

how many lines/sizes
1/4 return
5/16 vent
3/8 main feed
1/2 filler vent
my 79 Jimmy
you can syphon from the tank any where along it just has to be lower then the tank
so a tin can under the front even

[mexlokote]

has 2 lines
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[86c20]

i would say that if you fill the bowls on the carb with gas from a bottle it should prime fine if the lines are right. stop useing strating fluid to get it going a spray bottle is all you need to feed it thro the carb air inlet or like i said fill the bowls. if your lines are backwords i think that the vent is right on top so you will never get any gas from it.

[motornut]

if i have to put gas down the carb
I use a small plastic soft drink bottle with a screw on plastic cap
poke a small hole in the cap,and you can squeeze into the carb safely

[mexlokote]

thanks for the tip
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[hatzie]

Originally Posted by mexlokote

what happends if my fuel seding unit has the frame ground disconnected?


right now i changed my gas tank and my truck used to start right up before i changed the fuel tank, now it wont start, i checked and im not getting has in the carb,
my old fuel tank had frame ground disconnected too,
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Other than the fuel gauge intermittently nailing at 3:00. The truck should run without it. The sender needs the ground path to complete the gauge circuit.
You have a carburetor so it has nothing to do with fueling.

I'd check that the vent, feed, & return lines are connected to the correct sender lines.

[mexlokote]

i will check later on today
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