Replace the Fuel Sending Unit or just the fuel sending unit?

Replace the Fuel Sending Unit or just the fuel sending unit?

Postby blendergasket [OP] » September 3rd 2020, 3:23pm

Hi! I am about to replace the fuel pump this weekend. I got an AC Delco fuel pump as was planning to replace just the pump. All the videos I see on youtube look like they're replacing the sender unit as well as the fuel pump. Should I replace the fuel sending unit as well?

If so, is this something I should pay the (incredibly high) premium on to get AC Delco? Or will another brand be OK.
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Re: Replace the Fuel Sending Unit or just the fuel sending u

Postby N6KB » September 3rd 2020, 6:26pm

When I bought a new pump the gauge sender was part of it. The new pump you get may be an upgraded version (as mine was) and your old sender may not be compatible with the new pump. I recommend changing it all.
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Re: Replace the Fuel Sending Unit or just the fuel sending u

Postby gman » September 3rd 2020, 6:46pm

The reason you see a lot of people doing that, is because it's cheaper to rebuild a pump with a new sender unit /filter, etc. than it is to buy a whole new one.
I still have my AC Delco laying around, which I may or may not rebuild, but my Denso unit is working great, and Denso has great QC, so I'm not sure what to do with it.
Either way, the rebuild kit is about $65, whereas a new pump would be closer to $300, so that's why you see that.

All the pumps I have done have just been R&R.
Take the old one out, put the new one in.
You get a new shell, float, o-ring seal, fuel pressure sensor, fuel sending unit, screen, some other tank sensor/switch for the sending unit, etc.

Some people say Delco/Delphi or bust, some say that their eBay pump has been working fine for 50k, etc.
Unless I have a van with 100k or less, I can't see myself getting the best of the best OEM just for the sake of it (otherwise I would).

I guess that's kind of up to you and how much you want to invest in the van, and how long you think it will last you.
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Re: Replace the Fuel Sending Unit or just the fuel sending u

Postby blendergasket [OP] » September 3rd 2020, 7:09pm

OK. Thanks all for the info. I think I'll replace the whole thing.
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Re: Replace the Fuel Sending Unit or just the fuel sending u

Postby AstroWill » September 3rd 2020, 7:16pm

It just depends on your preference. Usually it will be replaced as a whole unit because time is money. Also the sensors can wear out, so while you have the tank down, might as well.

But it's perfectly fine to simply replace the pump as well, that is how it always used to be done and it always costs less that way.
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Re: Replace the Fuel Sending Unit or just the fuel sending u

Postby SheldonYoung » September 3rd 2020, 10:06pm

Put a new ACDelco Fuel Pump in my '97, and no other issues.
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Re: Replace the Fuel Sending Unit or just the fuel sending u

Postby Mmusicman » September 4th 2020, 1:33am

gman wrote:..a new pump would be closer to $300..

New Delphi FG0288 pump for $183..
https://www.amazon.com/Delphi-FG0288-Fu ... olet+Astro

Rock Auto sells FG0288 about same price too...
https://www.rockauto.com/en/catalog/che ... mbly,10147


Seems to me if you go to all the trouble to pull the unit.. might as well replace the pump.
They notoriously go bad when you least expect it.
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Re: Replace the Fuel Sending Unit or just the fuel sending u

Postby blendergasket [OP] » September 4th 2020, 3:27am

I've got a 94. I don't think those will fit. I ended up getting a spectra brand one on Amazon. I went to the big Autozone by me as I thought their site said they had the ACDelco, but they didnt have it. They tried to sell me a Spectra one for $148. I checked Amazon and it was about 1/2 the price so I went with that one. I hope it works well! I'm planning on cutting a hole in the floor to access it per the fuel pump replacement thread. I've got the pump and the aviation shears coming on Saturday.

Exactly how I was planning on spending labor day weekend /s
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Re: Replace the Fuel Sending Unit or just the fuel sending u

Postby MechBob » September 4th 2020, 4:15am

Shears are really going to suck trying to cut that.I use a die grinder with thin cut off wheels, but could be done with electric grinder with cut off wheels.I have used Spectra stuff for years with no problems.AC, and Delphi prices are way out of hand right now.But Delphi is getting bought out,maybe for the better.
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Re: Replace the Fuel Sending Unit or just the fuel sending u

Postby blendergasket [OP] » September 4th 2020, 5:30am

I have a grinder but I worry about sparks near the gas tank. I was thinking about starting the hole with the grinder and then using the shears. Would it be OK to just use the grinder?
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Re: Replace the Fuel Sending Unit or just the fuel sending u

Postby MechBob » September 4th 2020, 5:41am

I have done half a dozen that way.As long as there is no fuel leaks.And i take water hose and spray on top of tank,incase of any mouse nests.
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Re: Replace the Fuel Sending Unit or just the fuel sending u

Postby blendergasket [OP] » September 5th 2020, 3:27am

That's a good idea to spray off the top of the tank. Thank you for that.
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Re: Replace the Fuel Sending Unit or just the fuel sending u

Postby blendergasket [OP] » September 6th 2020, 2:48am

My tank is down a bit below 1/4 full. Do I need to fully empty it before I replace the fuel pump through the van floor or can I just leave it as is?
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