Anyone mount External fuel pump?

[threewood]

Yep, but here is what I’m up against. The car came to me unfinished, and tank empty, thoroughly cleaned. The picture here is where a 5/16 hole drilled into the sender base plate for the pos and neg wires. Note only a rubber grommet used … so im sure once fuel gets to that level it will pour out. I’ve searched and searched for a gas proof leak proof fitting to use there, but all are about 3/4 hole needed. The base plate is not exactly flat, that hole size will not seal. Hence my wanting to go externalView attachment 1938356View attachment 1938357

Get some gas tank sealer epoxy. Remove the grommet, and pack both sides around the wire with the epoxy.

 

[kiwigtx]

Get some gas tank sealer epoxy. Remove the grommet, and pack both sides around the wire with the epoxy.

He better make sure that the wires are not hard against that hole edge.....or it might not go well.

Better idea would be to get a pair of metal (brass or steel) studs with insulators to pass through the face of that sender unit - just like the factory did it with the OE sender resistor wire. Trouble is that the sender unit is limited for space.

I can only see pain and problems in the picture posted.

 

[koosh]

Im searching for a “gas proof” grommet, if there is such a thing, maybe pack the grommet and wires with Seal-All ?

 

[j-c-c-62]

The grommet, unless made of nitrile?, likely will not handle long term immersed fuel exposure, and will swell or decompose while separating from any used adhesive. The solutions proposed so far are IMO rather risky. Time to rethink this endeavor.

Nitrile rubber - Wikipedia

 

[koosh]

The grommet, unless made of nitrile?, likely will not handle long term immersed fuel exposure, and will swell or decompose while separating from any used adhesive. The solutions proposed so far are IMO rather risky. Time to rethink this endeavor.

Nitrile rubber - Wikipedia

I’ve actually just now found nitrile grommet . Do you think if i stuff the 2 10gauge wires through it, and fill it with Seal All, would work?

 

[j-c-c-62]

I would be more confident if you brazed/soldered? a 5/16"-3/8" 90 degree steel elbow into the existing hole with elbow turning straight up and if possible the open end above the top of the tank any bit, and running the wires thru that after deburring and filling the elbow full if possible with a fuel resistant epoxy off the car, it's still a bit of a kluge but addresses most of the risks here with little cost/effort.
Nitrile is your best flexible solution but because it is not a mechanical fastened solution, it will swell slightly over time and might seep.

 

[koosh]

All said and done, im gonna pursue (if possible) mounting this fuel pump externally somehow as close as i can to the level of lowest point of the tank, thereby eliminating this sender with a hole in it, and put in a new (hole less) sender. Maybe i can develop a bracket which bolts to trunk floor and hangs down even with the bottom of the tank????
Probably look like crap from street view

 

[koosh]

How about pros and cons on this crazy idea…
Mount my fuel pump close as possible to the tank (it will be higher than the tank), BUT- from the sender outlet is short hose to check valve to pre filter to the pump???

 

[BDnFL]

I’ve actually just now found nitrile grommet . Do you think if i stuff the 2 10gauge wires through it, and fill it with Seal All, would work?

If you keep the pump in the tank.
Use this as a bulkhead fitting. One side is pipe threads to accept a nut of some kind. You can get these in different sizes and the center drilled out if the wires are tight passing through.
Also seal it with a gas compatible sealer.

 

[koosh]

If you keep the pump in the tank.
Use this as a bulkhead fitting. One side is pipe threads to accept a nut of some kind. You can get these in different sizes and the center drilled out if the wires are tight passing through.
Also seal it with a gas compatible sealer.

View attachment 1938685

If they come small enough to fit in 5/16” hole…. Would have to be tightened down on inside and outside of the tank, then fill it with seal-all and push the wires thru….
Something to think about

 

[BDnFL]

If they come small enough to fit in 5/16” hole…. Would have to be tightened down on inside and outside of the tank, then fill it with seal-all and push the wires thru….
Something to think about

There’s a big variety of sizes.
As retired HVAC guy that’s where my search led me.
Just for information check Grainger, McMaster Carr and Home Depot online.