In tank fuel pump???

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

I would just make a hole in top and bottom where the pump goes through. As long as the pick up is under the bottom of the tank your ok. You can then build a sump underneath the tank around the pick up. If you only have the one hole in the bottom you'll keep the fuel trapped in the sump in almost any position. Then you can make the sump as big as tank and clearance allow you to. If you want to I can make a drawing.:)
 
Keith,

Keep in mind that most in tank pump sumps are only 1" to 1 1/2" deep at most. Again, you are just trying to keep the pump imersed in fuel on steep angles. A sump is like a Roach Motel, fuel can get in, but not get out. ;)

Because this will be an "offroad" type vehicle and it will see steep angles more often than a factory rig, I would make the sump a little bigger than a factory one, but you don't have to get crazy.

Jack
 
waiting for time said:
I would just make a hole in top and bottom where the pump goes through. As long as the pick up is under the bottom of the tank your ok. You can then build a sump underneath the tank around the pick up. If you only have the one hole in the bottom you'll keep the fuel trapped in the sump in almost any position. Then you can make the sump as big as tank and clearance allow you to. If you want to I can make a drawing.:)
Click to expand...

No drawing required. I guess you are right though, you could also make an entire sub tank just for the pick up. My focus was a little narrow, but that statement sparked a pretty good idea of how to do it. Thanks brother !

K
 
If the entry into the "subtank" isn't the low spot in the "main tank" then you could "run out of fuel" before you actually run out of fuel, even on nearly flat ground. This is a pretty low-fuel scenario, though, but a lot of the mental work here is to suck out the last drop before you're sucking air.

The big problem is... I'm pretty sure you're going to spend a lot of time on non-flat ground.

The question, then, is what happens when you're kinda stuck in a notch at a 45 degree angle on your side, or you're trying to get up out of a hole or over an obstacle 50 degrees nose up. How long will it take to pump out the fuel in the sump if the tank is at a severe angle? How much fuel can you hide from the sump in one of these realistic 4 wheeling situations?

If you put the sump in the dead center of an essentially cubic tank and you lean it fully 90 degrees over, then you'll suck air with slightly less than half a tank. In the same tank, you'd suck air at 45 degrees and slightly less than a quarter tank.

The wider a rectangular tank, the closer to "half a tank" you can hide from a centered sump when leaning to the side. If you rotate the long axis of the rectangle front/back, then the more you can hide in a nose-up or down situation.
 
Which is why I have baffles instead of a sump...
 
Mace said:
Which is why I have baffles instead of a sump...
Click to expand...


Too late for me!

Seems then the sump and ultimately the pump should located either at the front or the rear of the of the tank for my situation for best fuel coverage? What the doc said makes sense in that regard. If it's in the middle, I'll be more likely to experience the dry pump phenomena that I'm trying to avoid. I'd guess that there is equal time on the average trail that I run I'm nose down vs. nose up.
 
Nose down you are not on the gas and using as much fuel. Put it in the back
 
Agreed. The gas pedal isn't used as much coming off a ledge! This is more of a side-angle issue.

For example, when you come to visit, and we run Woodpecker mine trail and Highway to Hell, there are a couple of places where there are deep notches to straddle. If you fall in, then the fluid level in your tank will look like this:

attachment-2.jpg



Edit:

Here's what I'm talking about...

This is the "firehole" on Woodpecker.

P1120007.jpg


This is the gatekeeper on Highway to Hell... same canyon but farther up.

P1120014.jpg


Incidentally, I'm pretty sure it was an earlier assault on the H2H gatekeeper obstacle that put the hurt on the windshield in the built Tacoma shown in the first photo! I don't have pics but I fell in there too. ;)
 
Last edited:
Chop Shop said:
Man I could have replaced 40 inline pumps with less effort than all the typing in this thread.
Click to expand...

LOL!!!:lol:

FAWKER...this is my FIRST TIME through this stuff. Cut me a LITTLE slack!
 
Mace said:
Nose down you are not on the gas and using as much fuel. Put it in the back
Click to expand...

BellyDoc said:
Agreed. The gas pedal isn't used as much coming off a ledge! This is more of a side-angle issue.

For example, when you come to visit, and we run Woodpecker mine trail and Highway to Hell, there are a couple of places where there are deep notches to straddle. If you fall in, then the fluid level in your tank will look like this:

attachment-2.jpg



Edit:

Here's what I'm talking about...

This is the "firehole" on Woodpecker.

P1120007.jpg


This is the gatekeeper on Highway to Hell... same canyon but farther up.

P1120014.jpg


Incidentally, I'm pretty sure it was an earlier assault on the H2H gatekeeper obstacle that put the hurt on the windshield in the built Tacoma shown in the first photo! I don't have pics but I fell in there too. ;)
Click to expand...

I may then have to drop the level rear of the tank for the pump to fit. That actually kinda FU*KS me to the point that it just might be more practical to run an in line pump.

Here is the top opening to GAIN as much space as I could for the wrap bar, and also where I was planning on putting the pump for access.
009.webp
010.webp
 
Do you have room between the bottom of the pump and tank floor to attach multiple Walbro pickups? If you don't have baffles that would be the solution to the angle issues.
 
I think the best way to do it is to develop an electronic device that controls 4 in tank fuel pumps, that measures angle of the tank and activates the pump most likely to have a wet intake. If this is either to expensive, to complicated or all of the above just go with what you where planing to do. Every other system has circomstances where it won't work.:doh:
Just carry some extra fuel just in case and it will work.
 
Just thinking about a different solution. Its a theory so please comment on this. You can make a hole in each corner of the tank and connect it to a separate sump below the bottom of the tank. If the sump is big enough there gravity will keep it filled with fuel as long as one of the 4 holes delivers. Fuel is heavyer than air. You can then attach an inline pump. You can place the sump out of harms way, the lower the sump the better it works. You can put a lock device, floater, above each hole if you want to make shure you dont suck air in the sump.

Any reason why this won't work?
 
I KNOW I KNOW!!!!

Drill 4 pickups in each corner of the tank, then put a BUNCH of pingpong balls in the tank, this way, when you lean the truck over, the ping pong balls will plug each intake point that is above the fuel line. SIMPLE!!!
 
Just weld a sump on the bottom of the tank. Then cut a hole in the bottom of the tank to feed the sump but only cut say a one inch hole so fuel in the sump cant slosh out, only enter then get trapped.

Then the sump gets a fitting welded to it to feed a prefilter then the inline pump.
tank.webp
 
there is a reason why there is only a year warrenty and if you didnt buy a sock or a filter during the purchase they can say no on the return. Do they always, no. I sell a bunch of inline pumps daily and Airtex is by the worse brand sold. . I would recommend AC Delco, cause at times it is avilable more most GM models.....its hit or miss but it depends on the manufacture. yea you are right.......you are rolling the dice on most crap now.
Chop Shop said:
I never said your truck was butt asss ugly, I said stock fj45 bedsides are butt asss ugly. Not everything toyota produced was beautiful.

I know the gm efi uses a different pressure pump than my ol 22re. My pump is a E2000.


While one setup may be better than the other the fact of the matter is with the quality of todays auto parts going to the shiitter I dont think any one pump style could be expected to last longer than another.

I might get a good inline pump that lasts 10 years and you might go thru 10 intank pumps before getting a good one.

Personally I think its a roll of the dice. I cant control how good the MGFers make products, but I can control how easily servicable the shiitty parts are to replace when I am mounting things.
Click to expand...
 
Medusa said:
Do you have room between the bottom of the pump and tank floor to attach multiple Walbro pickups? If you don't have baffles that would be the solution to the angle issues.
Click to expand...

This, I was actually considering IF I could get the stock pump filter off of it and see if there would be a way to extend the pick up down to the sump on the rear of the tank. Donna if it's possible or not, but .... This would solve a lot of issues.
 
chicago said:
This, I was actually considering IF I could get the stock pump filter off of it and see if there would be a way to extend the pick up down to the sump on the rear of the tank. Donna if it's possible or not, but .... This would solve a lot of issues.
Click to expand...

What if you would run a pipe through the bottom of the tank and connect the in tank pump to it on the top. Then create a sump in the bottom which is connected to the tank by the 4 holes in the corner. The sump would be fed in every position of the vehicle and if the flow to the sump from one hole is bigger then the pump sucks fuel in you would have the sump filled with fuel as long as there is fuel in the tank. You could run the tank dry and most the sump. And this will work in almost any position of the vehicle.:hhmm:
 
You must log in or register to reply here.

Share this page

Back
Top Bottom