Sockless InTank Fuel Pump: Regina

[84B23F]

1993 940 Regina came with a single fuel pump placed within a "plastic" tank. When inspecting tank's insides, it was clean as a whistle, and the removed fuel pump was clean.

Fuel pump was installed without its sock, and after several months, it still runs quiet. Starts just fine, and idle RPM is rock solid.

On a metal tank, doing this might not be advisable. YMMV...

 

[thelostartof]

I wouldn't recommend this on a plastic tank either, I have seen the filter on the pumps clog from dirt and debris from the fuel. Just run one, they come with a new pump and they are cheap for just a filter itself.

You might of been lucky having good fuel the last few tanks but that can go bad quick with one bad tank. There is a reason most cars have two filters with one typically needing to be changed every 40k.

 

[lookforjoe]

The sock isn't a question of metal vs plastic tank, as tlao said. It's there because shit gets in with the fuel. Cheap insurance.

 

[84B23F]

I have seen the filter on the pumps clog from dirt and debris from the fuel.

Previous sock was clean...E10 fuel "cleans" tank/lines...vehicle is a daily driver, and tank is frequently filled up. Again YMMV...at your own risk.

LINK: A Quick Review of State Regulations for Fuel Dispenser Filters​

Arizona​

The state of Arizona mandates gas station owners use:

• A 10 micron or smaller pore-sized dispenser filter for gasoline, gasoline blends, and ethanol flex fuels
• A 30 micron or smaller pore-sized dispenser filter for diesel, biodiesel, biodiesel blends, and kerosene fuels

 

[thelostartof]

I have seen this on e10, e54, and e85 tanks of fuel. Hell even in the mtbe days I used to see filters get clogged. My e85 car was the worst of the group but again that was expected.

No power gain from this mod, well maybe a little from less amp draw on the pump because of less restrictions. Just not worth the $5 in saving of buying the filter, but hey to each their own.

Iirc sump fed cars do not have filters due to the design but those cars are typically not DD that see much pump fuel.

 

[84B23F]

...maybe a little from less amp draw on the pump because of less restrictions.

Bingo....AND....better laminar flow of fuel inside pump, which might extend pump's lifespan

 

[84B23F]

shit gets in with the fuel..

A bacteria called Acetobacter oboediens produces acetic acid, which is corrosive to various plastics and metals, including stainless steel. For older vehicles using E10, a person should be getting their tank filled weekly/biweekly, keep the gas cap screwed down, or be using a fuel additive....

Most likely, acetic acid damage here, due to vehicle sitting with E10 fuel...my removed pump/assembly was clean. "Shit" was growing in this fuel tank...

Pic Via: 1993 945 Regina Revival - No start issues

 

[lookforjoe]

A bacteria called Acetobacter oboediens produces acetic acid, which is corrosive to various plastics and metals, including stainless steel. For older vehicles using E10, a person should be getting their tank filled weekly/biweekly, keep the gas cap screwed down, or be using a fuel additive....

Most likely, acetic acid damage here, due to vehicle sitting with E10 fuel...my removed pump/assembly was clean. "Shit" was growing in this fuel tank...

Pic Via: 1993 945 Regina Revival - No start issues

His sender is a work of art at this point - this photo is awesome. I love the evidence of nature in action, along with the severe overheat at the terminals