Outer Limits 4x4 Board

Hi,

just wondering if there is any benefit in fitting a low pressure holley fuel pump before the filter to assist the flow of fuel to the pump.
My fuel pump is basically new. Done 5000k's
If i was run around the 20 psi mark (what ever i can get it to efficently on the dyno) will it be worth plumbing one in?
Will there be any performance gain?
What effects if any will 5psi have on the mechanical pump?

Cheers

my mk turbo diesel runs a carter black and no mechanical lift pump. Goes much better.

http://www.patrol4x4.com/forum/

a fair bit of info on pumps.

for a fairly stock motor i think 15psi boost is heaps.
has an advantage even on stock motors. some are getting away with just useing facet pumps which imho are to small. holly red is a good choice, holly blue tends to wear out quicker and you do not need the extra pressure or flow.
also its very handy when you fit extra filters to help get rid of water etc out of the fuel.
preffable use a pump that can flow fuel through it when off. just in case the pump fails the IP will still suck fuel through.

Thanks mate.

Do the holley pumps still allow flow if they fail??
What are the advantages???
What do you classify as stock motor??

I was looking at holley blue but now you say that i will go for the red.

Cheers

holly red does, not sure about blue.

the advantage of flow through is if you damage the cable the injection pump will still get some fuel, otherwise you will grind to a hault and have to fix the cable to get going.

performance wise they tend to run a bit better. not sure why. with a wound up injection pump which tend to run low on fuel, the electric pump keeps the injection pump supplied with fuel so you get better more reliable performance.

holly red would be preffred, they are also more reliable.

plenty of info and pics around of installs.

From what I was told, basicly the injector pump can empty the filter faster then the feed pump can fill it. The feed pump is a vane pump inside the injector pump. Also if the feed pump is worn or damaged the electric pump will mask the problem.

I use the Carter 200 litre per hour pump, it is quieter and more reliable than the Holley products, works with petrol and diesel and at around $200 isn't bad value.

Joel

Thanks guys for all the advise.
I ended up picking up a holley red earlier today for $146 inc. So i will fit it over the weekend and see what happens. Was told not to go the blue as they burn themselves out quicker as you have to restrict their flow with a reg.

Cheers

Where can you buy them?
Except from ebay.

You guys reckon it would make an improvement on a n/a TD42 ?
It would sure make bleeding it a lot easier plus I could run a second filter....... But otherwise?

you can buy them from supercheap auto and places like that... i wouldn't bother putting one on an N/A td though until you have done some other mods like extractors, exhaust, pump mods etc... otherwise you will just be pumping in fuel that you can't use. also a snorkel and high flowing airfilter will help it along too.

Tomo_89 wrote:....... otherwise you will just be pumping in fuel that you can't use. ........

it doesn't push more fuel in. injection pump controls how much fuel goes in.
the pump on a NA is not pushed for flow so there is no starving to correct. there will be minimal improvement tho very handy for bleeding filters and good when running multiple filters.

the other thing here you can do is help get rid of air out of the fuel and "fuel polishing". basically fit a return line and a one way valve so excess fuel gets pushed through the filter and back to tank. air removal requires a few mods to a filter setup. basically traps any air in the filter and the air is pushed back to the tank with the excess fuel.

yeah i previously had in injection set up in my patrol before i put the turbo diesel in. So i've got a low pressure lift pump (facet i think) which i used to use to fill the surge tank and a VL style inline efi pump sitting round at home. put the lift pump in and you can hear it being sucked thru under load so i think its doing jack all! but i dont wanna put the efi pump on cause i'm worried the pressure will be too great for the injector pump..... Any opinions on this

efi pumps are way to high a pressure for the injection pump. you can use one of you use a bypass regualtor, but a decent one of those that can do low pressure will cost the same as a pump. cheap way is to use a spring loaded check valve as a bypass regulator. i don't know if the high pressure injection pump is going to like running at low pressure.

some of the USA trucks use high pressure intank pumps with 10- 15psi regualtors.

Well, on my n/a TD42 I have snorkel, extractors and 2.5" exhaust with high flow muffler .

I might give it a go anyway as I would like to add another filter somewhere down the track.

A.J. wrote:Well, on my n/a TD42 I have snorkel, extractors and 2.5" exhaust with high flow muffler .

I might give it a go anyway as I would like to add another filter somewhere down the track.

Did you end up putting the pump in?.
I have the same set up and have thought about fitting one.
I suppose it can only help by supplying a constant fuel, therefore taking the strain of the IP lift pump when under load. Any power increase would be a bonus.

pongo wrote:my mk turbo diesel runs a carter black and no mechanical lift pump. Goes much better.

I dont use a carter any more, broke 2 in 4 months. Gone back to a ebay holley copy as the previous one lasted a year and was 1/2 the price of a carter.

Carter was more powerfull but they wont sell parts like they claim to.HAd to return for warranty, not much good when warranty runs out.

any links to the ebay copy pongo?

Na I haven't got around to installing one yet.

I will set up a turbo within the next few weeks so I think when that goes in, I'll get a holley.

nastytroll wrote:any links to the ebay copy pongo?

there the $100 pro comp ones. search

Thanks pongo.

They don't have a "buy it now" section for the fuel pumps but I'm assuming they sell 'em often. So I will not post the link incase pongo is bidding.