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Choice Of Eletric Fuel Pumps


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#1 booton

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Posted 07 June 2010 - 03:28 PM

ok i have 998 which i have done a fair bit of work on.

i need to upgrade the fuel pump as i feel at low revs the fuel pump it just not up to the job.

there are 3 choices i was looking in to, all would be fitted with a fuel regulator

1st is a standard eletric fuel pump built for the mini and su carbs.

2nd is one of these
http://cgi.ebay.co.u...e=STRK:MEWAX:IT
a universal 12v fuel pump, advantages of this is it very small and does a good out put. this would be placed in the enggine bay.

3rd is a walbro style fuel pump that would be put in the boot.
http://cgi.ebay.co.u...=item1e5c17304d
this has a higher output but i don;t know weather the output would be to to high and push fuel straight out of the overflow in the carb.

your susgestions please steve

#2 Big_Adam

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Posted 07 June 2010 - 03:31 PM

7psi?

Thats WAY too high. You want like 5 or less.

#3 booton

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Posted 07 June 2010 - 03:36 PM

7psi?

Thats WAY too high. You want like 5 or less.


well its a 7 max runs 5 to 7 psi

#4 AndyMiniMad.

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Posted 07 June 2010 - 03:36 PM

The standard mechanical pump will be more than adequate to supply fuel to your 998. but you dont say what carb your using. I fitted a facet solid state pump in the boot with an in line filter. Im running a 1275 mg engine with a big valve head and hif 44 carb. and the mecanical pump fed it fine. I only fitted the facet pump because im into bling bits.

#5 booton

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Posted 07 June 2010 - 03:42 PM

its a 998 hif 38 12g940 head ported and machines. k&N and all the other usally stuff.

i have a few friends that race in the autograss and they have to stick to the tunning rule so they can't tune it as much as mine and all of them run a eletric fuel pump as its needs and the dyno says so.

#6 dklawson

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Posted 07 June 2010 - 03:45 PM

If running SU carbs, you need no more than 3 PSI. 7 PSI will probably push past the float valves and cause you problems.

If you are planning on an electric pump "just because", do not put it in the engine bay. Put it on the rear subframe where electric pumps were mounted by the factory. This puts it below the tank so it doesn't have to lift any fuel on the suction side. Pumps push much better than suck. If you go with the type of pump you show in the link, mount it at the angle that will be shown on the installation instructions. There is a metal plunger in there that can wear the bore out if mounted purely horizontal.

However, as stated above, your mechanical pump is more than enough.

#7 Dave33

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Posted 07 June 2010 - 03:50 PM

If you want a good reliable pump then i would use a solidstate facet pump mounted in boot,then fit a pressure regulator near to carb,and set at 3psi,you dont need high pressure in a carb just consistent.i would of thought if you had problems with your pump not supplying enough fuel its gonna happen at high speed and large throttle openings,it wouldnt effect low speed.
The standard mechanical pumps are good enough for 100hp motors,but if you want to change to electric get a facet,wouldnt bother with anytrhing else.
Hope this helps
Dave

#8 liirge

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Posted 07 June 2010 - 04:20 PM

as stated the only reason that some change to electric, from mechanical whilst the mechanical is still in within its limits, is to save the smallest amount of power from the engine, if you are competing than you need every little bit power you can to gain an advantage.
I would also give my vote to a Facet solid state, mounted on rubber to the rear subframe, with all the appropriate earth wiring and an Inertia fuel Cut off switch. This should then be run into a fuel regulator like a filter king, and then for SU carburettors set at a constant 3PSI flow.

#9 AndyMiniMad.

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Posted 07 June 2010 - 04:33 PM

oops did not fit a fuel regulator to mine!! time for some more shopping me thinks. by the way how much power are we talking here liirge? surely not gonna gain anything from removing the mechanical pump. i know its driven from the cam and i suppose the less resistance to things turning all helps, but is it worth doing for power output. im not so sure. but i really dont know to much about this so am willing to listen.

#10 Dave33

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Posted 07 June 2010 - 04:38 PM

I think the main reason to fit an electric pump is they dont wear like a mechanical,as for power loss i doubt it would be even noticeable.If you want it to spin up faster fit a ultralightweight steel flywheel and backplate,and strip out the interior,and fit fibreglass panels.
Dave

#11 AndyMiniMad.

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Posted 07 June 2010 - 04:41 PM

Thanks Dave. my shopping list is getting longer Ha Ha




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