Pump Question...

[Pedro_The_Swift]

Not LR related,,,,


What is the difference in pump pressure if I fill a tank from the bottom up?

So not just dropping fuel into an empty tank, but pumping into the bottom of a tank half full?

Think truck/Bus fuel tanks, about a meter tall..

[Killer]

Less than filling from the top. Head pressure is approximately 1/2psi per foot of head. Feeding from the top means a slightly higher head.

[V8Ian]

I've never seen a heavy vehicle and I've seen a few, that needed fuel pumped from one tank to another.
Changing the subject somewhat, have you considered an appropriate hitch, for rowing with a heavy vehicle?


https://youtu.be/MRGDogbbLwQ'si=Er6TfyL2TYfp4Bv8

[Phil 850]

According to the link below, every 3 feet of fuel height the pressure at the inlet/outlet at the bottom of the tank increases by 1 psi.

Static Head - Petroleum Equipment Institute (https://pei.org/wiki_pei/static-head/)

So if you are using a pump that delivers 4 psi, you could pump fuel into the bottom of a tank until the fuel level reached 12 feet.

Hope this helps
Phil

[Old Farang]

Ok, I will be pedantic, mainly because this is a technical question. [smilebigeye]

While the posted answers are near enough for a simple question, the physics involved are a bit more involved.

The SG of any liquid needs to be known, along with the temperature, and even the gravitational force, before making calculations.
Petrol and diesel as examples have different SG's and viscosities.

Then the total head against a pump needs to take account of the friction head.

An unresticted pipe delivering into the bottom of a tank will have much less friction head than a stand pipe that by default will have to be constucted of several friction inducing fittings to deliver a liquid to the top of a tank.

Sorry, slow news day!!!

A couple of years ago I had an argument with an obnoxious know-it-all that insisted that his 1,000 litre surface water tank, that was connected from the bottom to his small garden pump, was exerting a pressure of 4,000 psi on to the pump through a 1" PVC pipe!

[Pedro_The_Swift]

I've never seen a heavy vehicle and I've seen a few, that needed fuel pumped from one tank to another.
Changing the subject somewhat, have you considered an appropriate hitch, for rowing with a heavy vehicle?


https://youtu.be/MRGDogbbLwQ'si=Er6TfyL2TYfp4Bv8

These are a hand-me-down from trucks towing vans.. been around for a while there..

but why do I need it? I'm not towing anything( once the van goes)...

[V8Ian]

Are you not towing the Range Rover?

[scarry]

According to the link below, every 3 feet of fuel height the pressure at the inlet/outlet at the bottom of the tank increases by 1 psi.

Hope this helps
Phil

As long as one does not forget to remove the filler cap,bleed plug or whatever, on the top of the tank,to relieve pressure while it is being bottom filled.

[Pedro_The_Swift]

Are you not towing the Range Rover?

nope, not worth the effort. Add up the cost of a third rego, third insurance, 3rd set of tyres/brakes and the simple cost of finding a trailer capable of carrying 3T legally. Having to have the bus re-certified to tow 6T. Di gets to play The Bandit to my Smokey...