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Old 03-05-2009, 08:47 PM   #1
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Default Replacing fuel sending unit

Hey All,

Well I'm new to this here. I just dropped the fuel tank in my 1999 se and I'm going to change the fuel sending unit. Before I start twisting and turning things I wanted to ask for some help. Anybody ever done this? Also, is it necessary to change the fuel pump too? Money is low and I'm just trying to get this car back on the road a.*.a.p! Thanks for any suggestions.
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Old 03-05-2009, 08:50 PM   #2
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Welcome to the Bonneville forum.

Take a look at this. Should help out a lot.

https://www.gmforum.com/t278863/
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Old 03-05-2009, 08:50 PM   #3
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Hi and Welcome to the Forum. Please add your year and trim of your vehicle into your signature. There is a how to in the Introductions to New Members area.

This might help you with the fule sending unit/pump issue. https://www.gmforum.com/t278863/
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Old 03-05-2009, 08:51 PM   #4
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Quote:
Originally Posted by Danthurs View Post
Welcome to the Bonneville forum.

Take a look at this. Should help out a lot.

https://www.gmforum.com/t278863/
..man your fast....
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Old 03-05-2009, 10:26 PM   #5
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Please disregard what Danthurs and Purplehaz posted as a link. It'* a link to a 2000+ Bonneville and unfortunately for my quick on the draw buddies..it'* soooo not right.

You can replace the sender only. Although if you have noticed your pump being noisy, you will probaby be back in there sooner or later. Hopefully it'* later.

Be careful on the plastic lines getting them off the sender. I find soaking them with pentrating oil for 10+ minutes helps tremendously. If the black end piece and o-rings stay on the sender..work them off as gently as you can. I've found the 1/4" 9mm-11mm sockets in my rack will help reinstall them and click the black piece back in place. This is the WTF.. why does GM want $75 for each of these 3 foot plastic lines fix. I've been lucky about 5 times getting the black end piece back off the sender line to put them back together, so yes..it'* possible.

Only other advice I'd give is blow the top of the tank around the lock ring off before you start and then again as you first start moving the ring to keep all the dirt you can from entering the tank.

If there are any questions, here a pic of a 96-99 basic tank. (98-99 had an additional evap sensor on it)


Sender with pump. (Note my pump is connected via a rubber hose, most are not)
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The normal connector between the pump and sending unit
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And the sender from the other side
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Old 03-05-2009, 11:59 PM   #6
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Default Replacing fuel sending unit

Thanks guy that helped out alot!
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Old 03-06-2009, 08:58 AM   #7
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Is it necessary to change the fuel pump when installing a new sending unit?
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Old 03-06-2009, 09:01 AM   #8
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You can change just the sender but you need to pull the pump to do it. If the pump is making noise or seems weak you may as well change it. Auto Parts Fast at RockAuto has good prices on parts. This might help. https://www.gmforum.com/t279801/

Also, please add your cars year and trim level to your sig so we know what we are helping you with.
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Old 03-06-2009, 10:10 AM   #9
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I merged your new thread question into your existing thread. Please keep all your related questions in this thread as it will be less confusing to those helping you.

And we found an answer in this existing thread to your question

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You can replace the sender only. Although if you have noticed your pump being noisy, you will probaby be back in there sooner or later. Hopefully it'* later.
The pump can be moved over easily to the new sender.

Last edited by BillBoost37; 03-06-2009 at 10:11 AM.
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Old 03-10-2009, 08:10 PM   #10
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Well I still can't quite figure out how the sending unit comes out of the tank. I've got the tank out of the car and don't want to break anything that I can salvage when I put the new one in. Could you give me some pointers please!
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