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formula for calc volume of liquid in a hose

Old 08-26-02, 04:13 AM
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formula for calc volume of liquid in a hose

I need some help with my higher math....


I think I can remember the

v= PI * r^2* L
L = lenth of hose

v= 3.14 * 1 * 120
v= 376.8
that 1 inch pipe 10 feet long
how do get amount of gallons in 376.8 ?
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Old 08-26-02, 04:39 AM
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ok I made a mistake on r^2
should be
my r should have been .5 for 1 inch pipe

V = 3.14 * .25 * 120
V= 94.2



94.2/231 = .4 gal in the pipe



is that right?

Last edited by 87GTR; 08-26-02 at 04:50 AM.
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Old 08-26-02, 06:20 AM
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.407 gallons is what I get.
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Old 08-27-02, 04:50 AM
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I can see it at the tech inspection.

Why do you have 100 feet of garden hose coiled up behind your seats........
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Old 08-27-02, 02:08 PM
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Garden hose will probably not stand up to the intense pressure of FI. With a carb that trick may work, but with FI the joke may be on you; or should I say "the gas will be on you." And if you tried to use a 1 inch hose as fuel line I don't believe the fuel pump could produce enough volume to create the needed pressure to keep the FI working correctly. If you plan to use it as some sort of hidden "just in case" gas then go for it. I'm all for bending the rules to get the competitive edge. Breaking rules usually leads to innovation.
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Old 08-27-02, 02:29 PM
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its not for FI its for air/water IC I have 2000 gph 12 volt pump
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Old 08-27-02, 02:30 PM
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ps I wont use garden hose for water. I was making a joke about why I would have a roll of hose in the back of my car
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Old 08-27-02, 02:35 PM
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I figured you were joking about the gas thing; but I just had to point out the side effects of such a thing before somebody tried it and had an accident.
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Old 08-27-02, 04:41 PM
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Originally posted by 87GTR
its not for FI its for air/water IC I have 2000 gph 12 volt pump
What pump is that?
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Old 08-27-02, 10:24 PM
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And if you tried to use a 1 inch hose as fuel line I don't believe the fuel pump could produce enough volume to create the needed pressure to keep the FI working correctly.
I don't understand this at all. Let's assume your pump can flow X gph at Y psi through 1/2" id hose. So what happens if you upgrade to 1" id hose? Well, the pressure regulator keeps you at Y psi. To get X gph, the flow need to move only 1/4 as fast as before, so flow resistance should actually be less and flow would go up a bit.

We can also try an analogy with another pump in the car... What happens to flow when you open up the exhaust?
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Old 08-28-02, 07:33 AM
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Originally posted by Eggie
I don't understand this at all. Let's assume your pump can flow X gph at Y psi through 1/2" id hose. So what happens if you upgrade to 1" id hose? Well, the pressure regulator keeps you at Y psi. To get X gph, the flow need to move only 1/4 as fast as before, so flow resistance should actually be less and flow would go up a bit.

We can also try an analogy with another pump in the car... What happens to flow when you open up the exhaust?
Flow would increase but pressure would drop if all other equipment stayed the same. I really have no idea; just guessing. Maybe the fuel pump is capable of keeping the same pressure with either sized hose but a larger diameter hose or exhaust pipe will decrease pressure if the force creating the pressure stays the same.
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Old 08-28-02, 08:43 AM
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I thought up a good analogy to demonstrate my claims:

Think of your normal old garden hose attached to your house. With its avarage sized hose it can create enough water pressure to blast away most dirt and grime off of you car but only flows a limited amount of water per minute. Now if you increased the size of the hose to say 1 foot in diameter you could now flow much more water through that hose in one minute ALTHOUGH now the water would be just barely pouring out of the end of the hose and not creating much water pressure. Thus the flow has been increased but the pressure has been dropped. Given that the source of the energy has stayed the same.
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Old 08-28-02, 01:58 PM
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Oops - my exhaust analogy stinks!

The garden hose is not the same scenario because that upgrade goes from a 1" outlet to 1'. In the fuel system, the fuel must exit through either the injectors or the pressure regulator, which a hose upgrade cannot affect. Unless you install a big leak...
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