5/8" tube in sending unit HELP

[zilla68]

who has pictures or a write up on it.
I'm seeing issues with mine and have looked but don't seem to find anything on installing the tube into the sender while converting to the 36 gallon tank.

any help is appreciated.

 

[pullandpray]

Never did it on a 7.3 but on my 6.4 I got a bulkhead fitting that was 5/8 tube on one side and 3/4 pipe on the other. I ran my return line the pickup tube (bigger diameter) then cut the return line off flush to the top of the sending unit. Then I used a step bit and opened it up so the bulkhead fitting fit in it. Then just plumb it as you wish. On the top side I used a 3/4 brass street elbow and a hose barb. But there's better ways of doing it

 

[psduser1]

Did your kit come with a bulkhead fitting? I'm assuming so.
When I did mine, I just pulled the sending unit, and drilled an appropriate size hole between the stock connections, measured the depth of the tank, and cut the pickup tube about 3/16" short.
Topside, I went to an npt fitting, and pushloc fitting.
Sorry I don't the any pics.

I used the 5/16 for the return, with a compression x pushloc fitting, and crushed and rolled the 3/8" nipple off tight. Just keeps the dirt out, and can't be seen, lol.

 

[mandkole]

Mines done similar to psdusers..

 

[zilla68]

yes mine came with all the stuff, but when I installed the 5/8 tube, it doesn't look like it will go straight down, it looks like it goes at an angle, so I'd not get max use of the fuel, it seems. I'll grab a picture of it in a few.

 

[m j]

mine is in at an angle

 

[mandkole]

is the tube cut or bent at an angle? I did not put mine together, but recalled a bulkhead type adapter and everything being square. Also, make sure the connectors are well sealed as any vacuum leakage is no bueno.

If I was to do this again, a sump would be in the plan. Inconsistent supply at less than 1/4 tank kinda sucks.

 

[zilla68]

but with a sump you can't run a spare tire can you?

post a pic if you are

 

[m j]

the unsupported line under the truck is why I didnt sump
on a highway only truck it would be fine but I live in the wild north

 

[zilla68]

mine doesn't see much offroad, but I"m not sold on the idea either of it dangling around under there.

 

[Jomax]

That's why u install a skid plate!

Sent from my SM-N900V using Tapatalk

 

[m j]

lets see a pic of your OBS sump install with skid plate please

 

[zilla68]

MJ

what about this?? seems like the answer if it will work, still has a sump but draws internally.
NO way I want to deal with 1/4 tank fuel issues and I can't use the fuel in the tank because of the straw I have now.
sometimes I might be at 1/4 tank with no station in sight and having a 1/4 tank of fuel you can't use don't make sense.
if this will work, I might go this route.
https://www.strictlydiesel.com/p-3278-fass-sump-kit-wbulkhead-fitting-stk-5500.aspx

 

[psduser1]

That is actually a decent idea, imo.
You guys talk about quarter tank issues, I've run my 29 gallon tank down to need 28 1/2 gal to fill, with no issues.

I cut my drawstraw about 3/16" off the bottom of the tank. And of course, steady state operation, not drag racing or hill climbing, lol.

Realistically, at a 1/4 tank, your ready to fill anyway, as the quarter mark, on my 29 gal tank is only about five gallons, or, roughly 75 miles. Should looked at the gauge before you left town, lol.

 

[zilla68]

I agree, and I have a 65 gallon tank in bed, but you know what happens when you LEAST expect it, your walking lol.

 

[psduser1]

I agree, and I have a 65 gallon tank in bed, but you know what happens when you LEAST expect it, your walking lol.

Lol, I hear you!

I made my drawstraw from 1/2", not 5/8", and built a piece to "baffle" the fuel around the pickup. It just slides over the 1/2", and the base is approximately 3". It's not fastened solid to anything, and I cut a couple of notches for fuel flow. Similar idea as the stock foot, only ss. Don't know if it does anything or not, really, but I'd like to think it keeps fuel over the pickup, slows the fuel slosh just a little. No pics, sorry, lol.

 

[m j]

I dont see the benefits of the tiny sump they are selling. if ti was a gallon sump then sure it will trap more fuel but the teacup sump is pretty unlikely to affect anything
the head pressure argument is the same weird logic. the column height difference is less then an inch.
try the draw straw and see if you have issues, you will see fuel pressure fluctuations not a stranded on the side of the road situation

 

[m j]

I dont see the benefits of the tiny sump they are selling. if ti was a gallon sump then sure it will trap more fuel but the teacup sump is pretty unlikely to affect anything
the head pressure argument is the same weird logic. the column height difference is less then an inch.
try the draw straw and see if you have issues, you will see fuel pressure fluctuations not a stranded on the side of the road situation

 

[zilla68]

I don't see how this wouldn't help.
it eliminates the draw straw, and eliminates the hose off the bottom of the tank.

after installing my 5/8 tube into the sending unit it doesn't even look like its pointing towards the bottom of the tank, I need to take another look at mine I guess.

 

[zilla68]

actually my idea is to use the fitting I already installed in the sender, cut the pipe off really short up by the sender, then attach the hose off the sump to the pipe I shortened