Replacing sending unit - will gas gush out?

[camrycurt]

I want to replace the sending unit in my in-cab gas tank and I'm wondering if I need to do anything to break the suction in the fuel line before I disconnect the hard line at the sending unit?

When I replaced my fuel pump gas gushed out of the line when I disconnected it, and I'm worried the same thing will happen again and I'd rather not soak my cab in gas if I can help it. So, to those that have done it, will I be OK just disconnecting the line or should I do something else first?

Thanks for the help!

[jsbgump]

Depends on how full the tank is. if its under a 1/2 it will be fine

[tex_waco_usmc]

Just to be on the safe side I would maybe crack the line at the fuel pump first. This will bleed off any pressure that might be in the lines, if there is any. But, as has been said already if it is below 1/2 a tank you should be ok.

Originally Posted by camrycurt

I want to replace the sending unit in my in-cab gas tank and I'm wondering if I need to do anything to break the suction in the fuel line before I disconnect the hard line at the sending unit?

When I replaced my fuel pump gas gushed out of the line when I disconnected it, and I'm worried the same thing will happen again and I'd rather not soak my cab in gas if I can help it. So, to those that have done it, will I be OK just disconnecting the line or should I do something else first?

Thanks for the help!

[cdowns]

if planning on replacing sending unit i always use a new oring gasket as the old ones sometime fall apart and cannot b reused

[fireman064]

Does your tank for lack of better words act like its under pressure when you open the gas cap? (spray a mist of fuel ) I'm curious how yours goes because I'm about to do the same project and I'm a complete newb. There is a good video on youtube of a guy changing his in a 69 or 70. Made it seem straight forward. Keep me posted thanks
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[oklalawnboy]

You should be fine as long as fuel level is below sending unit (1/2 is great safe point). Loosen the cap to let off any pressure in the tank itself. If you crack the line at the fuel pump, it will likely just sipon fuel. The line on the tank side(feed) of the pump is the suction side so should be no pressure. There may be an oz or two just from the line but a couple shop rags should take care of that. Good luck.

[Daddy'O]

Subscribed –

This is perfect timing as we are going to be replacing the sending unit in ‘Nancy’ tomorrow. Looks like I need to siphon some fuel before we start.

I’ve got a new gasket and lock ring. Are there any other heads up suggestions from those that have performed this procedure before?

Thanks!

[Daddy'O]

Got this done today. Siphoned 15 gallons of fuel out. Removed the seat & went to work. No fuel gushing at all, in fact not a drip got in the cab. The 41 + year old float was full of fuel. Replaced - and voila' the fuel gauge is now functioning correctly. Not too bad - maybe $50 total spent (I bought the tool to remove the lock ring) to have a functioning gauge.

[camrycurt]

Cool. Thanks to everyone for the replies and to Daddy'O for giving it a successful test run. Glad to hear everything went well!

Sounds like I'm going to run the fuel down low and swap it out with no problems. I won't know what to do with myself with a functioning gas gauge...

Thanks again!

[Daddy'O]

Let us know how it goes for you.

Good luck!

[69GWC]

Very simple to do, I did mine in about 20min .
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[Daddy'O]

Originally Posted by 69GWC

Very simple to do, I did mine in about 20min .
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69GWC is correct - If you take the time away from the siphoning - it took us only 45 minutes (I'm older and slower). That includes removing and replacing the seat.