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fuel pump mounting
https://www.ausmini.com/forums/viewtopic.php?f=2&t=26066		 Page 1 of 2
Author:  buztoy [ Sat Dec 23, 2006 9:17 am ]
Post subject:  fuel pump mounting
hey
im looking for a spot to mount my fuel pump, i was thinking near the radiator at the same hight or lower than the original mechanical pump,
cheers
Author:  drmini in aust [ Sat Dec 23, 2006 9:48 am ]
Post subject: 
Down the back, like the Cooper and S were.
They don't suffer from vapour lock in hot weather with it there, like Morrie Minors do.
Here's 2 pic of mine- (shown on the 850) mounted on a centre exhaust mount. :wink:
Note the wiring was just for test... 8)
Now mounted on Barney.
Image
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Author:  Mike_Byron [ Sat Dec 23, 2006 9:57 am ]
Post subject: 
Another very god reason for mounting the fuel pump at the back where the Cooper ones were / are is that very few pumps are good at sucking. They prefer to push fuel. So if the pump is mounted lower than the fuel tank at the rear it primes by gravity and then pushes the fuel to the carby fuel bowls.

SU carbies only need 2.5 psi - much more than that and the pressure will cause the needle and seat to push the float down and flooding will occur.
Author:  drmini in aust [ Sat Dec 23, 2006 10:01 am ]
Post subject: 
And use GOOD hose- the stuff shown in my pics is USA made and rated for unleaded fuel. It doesn't go hard like some do. :wink:
Author:  buztoy [ Sat Dec 23, 2006 10:45 am ]
Post subject: 
2.5 psi, someone told me 4 - 7 is fine, so thats what i got, it also has a flow rate of 135, but that is at max,
Author:  1310/71 [ Sat Dec 23, 2006 11:15 am ]
Post subject: 
Even webers and Dellorto's don't like psi up that high. It is the volume not pressure which is important. If you're committed to the pump, you could always add a regulator. I've used Malpassi's before with good success although on Datsun race engines, not A series, but the theory will be the same. It was feeding twin webers in most cases back then. I've just purchased a holley regulator to try on one of the Renaults. It has two out ports which I don't like ( I have to block one) and turns the fuel 90 degrees through the pump which Malpassi's don't, but otherwise seems OK.

Colin Dodds did a good article on an old MCCNSW chat forum (no longer in existance) about increasing the diameter of the delivery line and measuring the flow per minute at the carb before and after - a bit like calibrating a tap you might have done in year 9 physics or whatever.

Disconnect the fuel line at the carby and run it into a bucket or dish. Have someone turn on the ignition so the fuel pump starts, when the flow is constant, start to run it into a measuring jug and time for say 15 seconds (or less if it looks like filling said jug). shut it all off and put it into the original bucket. Multiply result in mls by 4 to give per minute. Make fuel line changes and repeat.

I run the same pump and setup on my mini as the Doc and have had no trouble.
KB
Author:  buztoy [ Sat Dec 23, 2006 11:23 am ]
Post subject: 
what should the rate per minute be,

its a 1310 with a wbber 42,

sorry should of exsplained the reason to why im asking the flow rate is so i dont need to take the pump out of its packet,
Author:  buztoy [ Sat Dec 23, 2006 11:59 am ]
Post subject: 
flow rate is 1.5LTR a minute max,

oh and i just re read it and it says operating pressure is 1 - 4 psi, but the static pressure is 4 -5 psi,
Author:  drmini in aust [ Sat Dec 23, 2006 12:04 pm ]
Post subject: 
I would try with no regulator to start with, if no flood, no problem. 8)

I run a 3 psi pump on both cars- it has no trouble feeding a 1360 with a 45 Dellorto running 38mm chokes.
The other one works fine on the 1293 with twin HS4 SUs.
No flooding probs with either, I don't run a regulator.

<edit> your 1.5L/min is 90L/hour, heaps........ :D
Author:  benjamin [ Sat Dec 23, 2006 2:27 pm ]
Post subject: 
im running holly blue fuel pump and regulator pump is good for 15psi and the regulator is set at 3psi

just fits on rear subframe , but is a fairly noisy pump

on my N/A motor i just used the facet 3psi pump (same as kevs) located in the same spot worked fine and had no troubles at all

Image
Author:  gafmo [ Sat Dec 23, 2006 7:41 pm ]
Post subject: 
mine's in the Boot....Its been thier for three years or so now with no dramers. I got sick of getting in Under Morris

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Author:  Mike_Byron [ Sat Dec 23, 2006 7:55 pm ]
Post subject: 
Gaf
Good setup but the same thing is applying in your case as well - you are mostly pushing fuel rather than sucking it. The pump is more efficient doing that and provided you are more than half tank full it is self priming.
Author:  Hanra [ Sat Dec 23, 2006 7:57 pm ]
Post subject: 
That setup would also cause fuel fumes in the car also....
Author:  Morris 1100 [ Sat Dec 23, 2006 8:16 pm ]
Post subject: 
Also remember that a pump does not like to suck through a filter. It prefers to push fuel through a filter.
Author:  Mokesta [ Sat Dec 23, 2006 8:33 pm ]
Post subject: 
Fuel pump at rear and below tank and pressure regulator just before carb is the ideal combo as per Doc's recommendation.

Moke owners will find this combo a real challenge unless they run fuel hoses under the floor or in the rear arch. Neither of these is ideal.

A big, non-restrictive filter before the pump is recommended if your tank has any sign of rust in it. Most pumps don't like chewing on rust particles. A second filter in the engine bay will catch any bits of rubber that shed off the inside of the hoses over time.
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