Making a fuel tank ?

[Blocky10]

I called the pressure test problems yonks ago in the black pearl prep thread :thumbs

Fair play if you've got it sussed but for how long? Can you honestly say you trust it now and was this the cause of the fuelling issues on the meet?

I doubt a small weld leak would be the cause. I'd be surprised if any of these trucks have a 100% seal.:lol

 

[Fez_uk]

Air was getting in at the top of the fuel filter from a bad alu washer

 

[makeitfit]

Pressure tested many times . Welded up again many times . Pressure held fine before I finally concluded all was well and painted it.
Following all the crash bang wallops on Sunday, I can see absolutely no evidence of dampness, let alone leaks
Even the fuel gauge works
As Fez says, the air ingress was partly the alu washer on fuel filter and some joins I'd thrown on without jubilee clips.
I just couldn't get all the detail work done in time and get to Bothy land :lol
I did fill it to the brim and calculated pretty close to 95 litres max.
I like the 3d modelling

 

[solarman216]

As a point of note here Pete, the "O" ring I used to replace the washer might not be fuel proof and swell (it came out of a generic box of rings) just to let you know, Rick

 

[rustic]

Mathematically as the main structure is a prism, ie of equal cross section, you just need to break the side panels into rectangles, and a trapezium, and add the surface areas, then multiply by the length to give the volume in cm3 then add on the volume of the two rectangular boxes.

Of course you would need all the dimensions.
:augie

 

[solarman216]

Mathematically as the main structure is a prism, ie of equal cross section, you just need to break the side panels into rectangles, and a trapezium, and add the surface areas, then multiply by the length to give the volume in cm3 then add on the volume of the two rectangular boxes.

Of course you would need all the dimensions.
:augie

Err yea right, my method is to fill it up and see how much it takes, easier numbers on the head, just read the fuel dispenser, Rick

 

[rustic]

Err yea right, my method is to fill it up and see how much it takes, easier numbers on the head, just read the fuel dispenser, Rick

But if you did that for every tank you made it would cost you over £100 in fuel lol. I know you would recycle it, lol.

The thing is if you are designing the tank from scratch to have a set volume, then you would need some calculations to support the suggested size.

 

[solarman216]

Sorry Rustic I was just jesting, I have no need to make tanks, but as always you are quite correct, numbers are just not for me in this line, on the other hand I have just calculated the heat loss from 8 rooms using a "Meres Calculator" but been doing it so long usually can guess within a digit or two of the KW required, everyone to there own, Rick

 

[rustic]

Sorry Rustic I was just jesting, I have no need to make tanks, but as always you are quite correct, numbers are just not for me in this line, on the other hand I have just calculated the heat loss from 8 rooms using a "Meres Calculator" but been doing it so long usually can guess within a digit or two of the KW required, everyone to there own, Rick

Being an engineer from the electronics field, I have learnt to be precise with current calculation, wire sizes and fuse ratings.
Even copper track sizes on circuit boards are important.

When I designed instrumentation, I always over designed the power supply by a factor of 2, plenty of potential for additions and increased their reliability by a factor of 4 this was fine for one off projects, but when I worked for a mass producer, it was frowned upon, make the supply enough for the job and no more, and as cheap as possible using parts supplied by the the lowest cost supplier. This went against all my principles.
I would have loved to have been in a team on scrap heap challenge, I know for certain, Rick would be the anchor man of the team. :thumb2


Rustic

 

[Blocky10]

"YOU HAVE HALF AN HOUR REMAINING. 30 MINUTES GENTLEMEN! ":lol

 

[rustic]

"YOU HAVE HALF AN HOUR REMAINING. 30 MINUTES GENTLEMEN! ":lol

Oh I forgot about that lol....

Now that would stress me out...
Take me off the team lol.:doh

Mind you judging by the projects on this forum, they mostly have good attention to detail, problem is, we would all run out of time lol.

The key to Scrapheap challenge is ... it looks about right... go with it. throw the calculator awa
You can see the fail points, where they have welded sprockets on, or shortened prop shafts you just know it's going to shear.

 

[Banshee]

My question is Pete

If this holds nearly 105 litres of fuel and you are using the same pickup gubbins from a standard Terrano tank, they carry 72 litres?

Surely this gizmo is calibrated for 72l so will misread as I presume the only way you have reached the bottom of the tank is with pipe :nenau

So when your car reads empty you actually have 33 litres left roughly which isn't all that bad to be honest :lol :thumbs

 

[makeitfit]

My question is Pete

If this holds nearly 105 litres of fuel and you are using the same pickup gubbins from a standard Terrano tank, they carry 72 litres?

Surely this gizmo is calibrated for 72l so will misread as I presume the only way you have reached the bottom of the tank is with pipe :nenau

So when your car reads empty you actually have 33 litres left roughly which isn't all that bad to be honest :lol :thumbs

What you think I am ? No wait, don't answer that :lol
That "gizmo" I made fit :sly a simple bit of low tech bending of the float arm means it is still as accurate as it ever was. Basically the same swept radius applies from bottom of tank to the top, as I bent it down and out if you see what I mean. Typically not a pic I took. I also extended the pick up bowl and pot assembly so it is still spring loaded to the base of the tank.
My old skool tank volume calculations reveal a capacity of more like 90-95 litres (well that's what the tesco pump said )
The only thing I didn't get time to do was the low fuel warning light, so that should come on now at about the 20-25 litre mark

 

[Fez_uk]

As long as you bend the arm so it sits at the bottom to calibrate it to 0 or low fuel it will still work the same

 

[Blocky10]

As long as you bend the arm so it sits at the bottom to calibrate it to 0 or low fuel it will still work the same

Unless it's on its roof

 

[Banshee]

Unless it's on its roof

:lol :lol :lol

 

[solarman216]

Oh I forgot about that lol....

Now that would stress me out...
Take me off the team lol.:doh

Mind you judging by the projects on this forum, they mostly have good attention to detail, problem is, we would all run out of time lol.

The key to Scrapheap challenge is ... it looks about right... go with it. throw the calculator awa
You can see the fail points, where they have welded sprockets on, or shortened prop shafts you just know it's going to shear.

Me too, I am under pressure on current job, 6 weeks to gut a complete 3 bed terraced house and put it all back together including two knock through's, tack and set all ceilings, hack of and render some walls and skim all, new kitchen and new bathroom in different room, all new electrics and much floor replacement/repair, full CH, decorate all round, client moving in on the first, carpets going in tomorrow, yet to fit bathroom, comprising bath/shower/wc/basin, upstairs WC, and all second fix electrics, boiler is on the wall (combi) they will have hot/cold water but CH rads will have to be after they move in, getting tired now, long days, Rick

 

[solarman216]

Sorry Pete, hijacked your thread, but it did just seem to fit, Rick

 

[makeitfit]

Update

Just had a few hours this week as been bonkers busy at work work
Time to make a cover for my fuel sender area bit Don't want loads of water coming in there .

So best make up a template .

 

[makeitfit]

Plenty of cardboard lays handy innit ��

Popped up the black Smith to get all bendy with it ☺

I"ll weld up the owners tomorrow then Rivnut it onto the floor .
Something like this

Getting there slowly.