Fuel tank sending unit... does it merit replacement?
 

The next system just about ready to redo on my 77 is the gas system when has been leaky since I've owned the truck.

I've got the tank out of the truck, and all the rubber was rotted up - the usual age + ethanol = bad things.

Now, I know the send unit to fuel line hoses were garbage. There is staining down the side of the tank from the send unit. It may be much or all of the source.

But I also took an inexact approach to testing the top for leaks - flipped the tank over with the in/out lines plugged on the send unit. There was seepage after about 1 minute sit time. (Pics attached)

I really don't want to put the tank in and yank it back out for another leak. Tank itself is nearly rust free (no scale/pitting, a couple areas turned light reddish brown powdery on the surface).

I'd think the tank should be leak free in my improvised test. I guess the o ring could be damaged but I wanted to leak test before taking apart since send unit is surface corroded from the leaking rubber lines on top.

Old gm parts (if reusable) are better imo than what's made nowadays... but... anyone have advice?

Re: Fuel tank sending unit... does it merit replacement?
 

I suggest replace all new. That way you should not need to remove anytime in the near future. I had to do that on my 74. Only been in since December, but I feel comfortable knowing it should last many years. I replaced tank, sender, strap kit (kept old metal straps), all rubber at tank. I really did not want to spend that much money, but no regrets. Old tank and sending unit were original and I feel all was original. I did not need to replace metal lines to engine on mine.

Re: Fuel tank sending unit... does it merit replacement?
 

Replace with genuine AC Delco sending unit - avoid Spectra aftermarket sending unit.

Re: Fuel tank sending unit... does it merit replacement?
 

I'm getting ready to replace my entire fuel system (minus the lines). I thought about just replacing the "bad" parts; but like someone on this thread already said---May as well replace all of it so you won't have to go there again. You are probably anxious to get the truck back on the road; but the time waiting for new parts to come in will be well worth it. I like the idea that another member posted about the AC Delco part--I will definitely invest in one of those as opposed to aftermarket.

Was it hard to tank the tank out?

thx

Re: Fuel tank sending unit... does it merit replacement?
 

Be careful of AC Delco. Delco has become a re-labeler. There are several grades on some parts. Economy, Service replacement, and Professional. None of them are OEM quality GM parts anymore.
AC Delco Professional grade parts should be pretty good but they are not exactly the same as the original parts. They are built to a price point just like most stuff nowadays.

Delphi was actually General Motors and parts from Delphi should be the same as OEM and at least made in the industrialized Western nations instead of the Third World Asian or Indian continent but, be aware, they aren't GM anymore either.

It's a brave new world eh...

Re: Fuel tank sending unit... does it merit replacement?
 

It was very very easy to remove. I searched and read up on some threads, then I looked hr hinges over and made my own slightly different plan.

I will say I had 2 things in my favor. 1) this inland Georgia truck only has 80k original miles, and, never left the county it was sold new in before I bought it. 2) it is bone stock, some parts missing, but nothing taken apart or changed - even the engine has its 100% intact factory paint.

So. Other than supporting it before undoing those tank strap brackets, I chose to disconnect the rubber lines from the steel fuel lines, and unbolt the clip that holds them to the frame. As I lowered the tank, didn't have to worry about reaching up to mess with the rubber sending unit hoses, they were free and came down with the tank to be dealt with on the ground.

Re: Fuel tank sending unit... does it merit replacement?
 

The only two choices I have seen for replacement sending units are AC Delco and Spectra.

It is true that Delphi is no longer GM owned. Nexteer (which was Saginaw Steering Gear, then a Delphi company, then Nexteer) is now Chinese owned. The rest of Delphi is on its own, but who knows where the parts are made.

Of course, AC Delco continues to say that they are "The true GM original equipment parts brand."

http://www.acdelco.com/gm-original-equipment-parts.html

Re: Fuel tank sending unit... does it merit replacement?
 

Ive been running a Spectra in mine for several years with no issues

Re: Fuel tank sending unit... does it merit replacement?
 

I put Spectras in my dual tanks and the fuel gauge needle bounces during takeoff, stops, turns. I have a new fuel gauge also. The needle always returns to an accurate level, but the bouncing does bug me.

Re: Fuel tank sending unit... does it merit replacement?
 

Re: Fuel tank sending unit... does it merit replacement?