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In-tank pump will not ground

240Redblock

240Redblock

Member
Joined
Jun 17, 2020
Location
Lafayette, CO
Recently the heat has been killing my main fuel pump, which is not unexpected given my in-tank was faulty. So I installed a new Delphi in-tank and the damn thing wouldn't run! I ran hot to the connector and nothing... eventually tried adding ground directly to pump and she ran! I tried adding a redundant ground to the sending unit, didn't help... years ago I dropped in an aftermarket sending unit because of rust issues with the original. Now I'm wondering if anyone had had luck running redundant grounds into the tank, or is there another option that won't allow fuel to leak?

Please help, thank you!
 
I put a much larger pump in the tank, and used a bulkhead fitting for the pump wires. Not a TB cheap option but separates the sending unit from the pump. Was about $140 but they have options.
Here is the link: http://www.radiumauto.com/Bulkhead-Fuel-Pump-Harness-and-Connectors-P682.aspx

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240Redblock said:
Recently the heat has been killing my main fuel pump, which is not unexpected given my in-tank was faulty. So I installed a new Delphi in-tank and the damn thing wouldn't run! I ran hot to the connector and nothing... eventually tried adding ground directly to pump and she ran! I tried adding a redundant ground to the sending unit, didn't help... years ago I dropped in an aftermarket sending unit because of rust issues with the original. Now I'm wondering if anyone had had luck running redundant grounds into the tank, or is there another option that won't allow fuel to leak?

Please help, thank you!
Click to expand...

I imagine you are using the stock springy leads on the Delphi pump? They are complete junk. Use the ring terminals that come with pump. Even on a stock sender, I always end up removing them and using ring terminals.
 
rb92673 said:
Here is a cheaper bulkhead connector designed for fuel.

https://www.summitracing.com/parts/abt-cfd-504

It's some kind of plastic, not metal. I filled it with a fuel safe epoxy after I ran the wires through.
Click to expand...

That's a $5 bulkhead from McMaster... I'll grab the part number....

Edit:
Here's the part number: https://www.mcmaster.com/7807K56/

Here are the other sizes if you want something different: https://www.mcmaster.com/cord-grips/for-total-number-of-cords~2/color~black/
 
I usually just drill a small hole in the top of the sending unit and using a small sheet metal screw and a ring terminal add the ground wire to the top of the sending unit. That usually takes care of the issue since the pump is grounded to the sending unit.
 
I see I am not the only one that had that idea. Different for you, I have a crappy rusted pump lid thingie that will mak eit fun to weld holes shut and open new ones that will not leak. And a crappy bulhkead connector I saved

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Update:

So there were two issues 1.) The springy connectors were definitely not performing properly and 2.) The sending unit wasn't grounding the pump.

I replaced the connectors with those provided and ran a wire through the sender and connected it directly to ground. I think the culprit there is the little strap at the top of the connector, but I didn't have my soldering iron and wanted to ensure I bypassed all that MTC stuff. Anyway, thanks for the help! She's running much better and will survive until her new in-line pump arrives this weekend.
 
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