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I removed my foam years ago because of the alcohol in pump gas with zero issues. These are the instruction that came with my BG400 pump.



Bypass
The return line should be fed with a single #8 or
1/2" line. Plumbing kit number 150187 is avail-
able for this application. The return should expel
the bypassed fuel into the liquid rather than into
the air space of the fuel cell. This will prevent
aeration of the fuel. All fuel tanks and cells
should have fuel cell foam installed to prevent
fuel slosh.
WARNING: DO NOT BLOCK THE RE-
TURN, VENT, OR PUMP FEED. MAKE
SURE THAT THE SYSTEM IS LEAK FREE
AT ALL CONNECTIONS...YOUR SAFETY
DEPENDS ON IT!
Wiring
BEFORE MAKING ELECTRICAL CON-
NECTIONS, DISCONNECT THE POSITIVE
TERMINAL FROM THE BATTERY.
Your BG400 Fuel system should be connected to
a fully charged 12 or 16 volt battery. A fuel
pump, like any other electrical accessory, will
only perform at its best when given adequate
voltage. The black wire is a ground (-) and the
remaining wire is a switched hot lead from a 12 or
16 volt source. If wired incorrectly, the pump wi

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Interesting? They don't tell you how long this line in to the fuel should be. Why not just plumb the return line in to the bottom of the tank if you are that concerned about fuel aeration?? That would cover all scenario's. JMO, but I aint buyin it.

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I think the reason they want it up high is to prevent any chance of suction. Kinda like priming a pump.

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"Any chance" means it can't be submerged in the fuel - I would think? Still doesn't answer how long the tube should be. My return line at idle dumps like a garden hose. The fuel still has to go through the foam, lines, and pre-filter before it goes in to the pump. If it still has air in it, God bless it! A bigger concern to me would be return ine back pressure / tank vent size.

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I removed my foam years ago because of the alcohol in pump gas with zero issues. These are the instruction that came with my BG400 pump.



Bypass
The return line should be fed with a single #8 or
1/2" line. Plumbing kit number 150187 is avail-
able for this application. The return should expel
the bypassed fuel into the liquid rather than into
the air space of the fuel cell. This will prevent
aeration of the fuel. All fuel tanks and cells
should have fuel cell foam installed to prevent
fuel slosh.
WARNING: DO NOT BLOCK THE RE-
TURN, VENT, OR PUMP FEED. MAKE
SURE THAT THE SYSTEM IS LEAK FREE
AT ALL CONNECTIONS...YOUR SAFETY
DEPENDS ON IT!
Wiring
BEFORE MAKING ELECTRICAL CON-
NECTIONS, DISCONNECT THE POSITIVE
TERMINAL FROM THE BATTERY.
Your BG400 Fuel system should be connected to
a fully charged 12 or 16 volt battery. A fuel
pump, like any other electrical accessory, will
only perform at its best when given adequate
voltage. The black wire is a ground (-) and the
remaining wire is a switched hot lead from a 12 or
16 volt source. If wired incorrectly, the pump wi

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I know sometimes I'm a bit out in left field, but I have thought about this before. like in a fish tank where water flows out of the filter and dumps into the water, its adding oxygen to the water, is it possible that when fuel is dumping into a fuel cell, is it adding oxygen to the fuel similar to some race fuels that are oxygenated

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If it is , its so minute you wouldnt ever see any affect..
I did a study on this at Chrysler and I found that
if it enters below its a lot less issue with air..
thats the reason we STILL return it well below the
fuel level... now we use the return to accumulate
more fuel in our reservoir that surrounds the pump...
injected engines HATE air(as in bubbles)... a ton
of air is induced at the carb when the fuel goes past
the N/S into the bowls

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I removed my foam years ago because of the alcohol in pump gas with zero issues. These are the instruction that came with my BG400 pump.



Bypass
The return line should be fed with a single #8 or
1/2" line. Plumbing kit number 150187 is avail-
able for this application. The return should expel
the bypassed fuel into the liquid rather than into
the air space of the fuel cell. This will prevent
aeration of the fuel. All fuel tanks and cells
should have fuel cell foam installed to prevent
fuel slosh.
WARNING: DO NOT BLOCK THE RE-
TURN, VENT, OR PUMP FEED. MAKE
SURE THAT THE SYSTEM IS LEAK FREE
AT ALL CONNECTIONS...YOUR SAFETY
DEPENDS ON IT!
Wiring
BEFORE MAKING ELECTRICAL CON-
NECTIONS, DISCONNECT THE POSITIVE
TERMINAL FROM THE BATTERY.
Your BG400 Fuel system should be connected to
a fully charged 12 or 16 volt battery. A fuel
pump, like any other electrical accessory, will
only perform at its best when given adequate
voltage. The black wire is a ground (-) and the
remaining wire is a switched hot lead from a 12 or
16 volt source. If wired incorrectly, the pump wi

---

I know sometimes I'm a bit out in left field, but I have thought about this before. like in a fish tank where water flows out of the filter and dumps into the water, its adding oxygen to the water, is it possible that when fuel is dumping into a fuel cell, is it adding oxygen to the fuel similar to some race fuels that are oxygenated

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Whatcha smokin there 6.................. But it actually makes sense for some crazy reason.

Except for the fact that the pump doesn`t wanna suck bubbles but solid fuel.............