Outer Limits 4x4 Board

just wondering what psi lift pump you guys a are running

cheers Tye

If your talking about a lift pump for the TD42, then it's a maximum of 7psi.

yeh sorry for not much info sweet i got a 4 to 7 psi one just heard some people were only running 2psi units....

cheers

hi
ive herd of other people doin this, so what is it to rectify, because every now and then my TD42 surges and farts around so if i get a lift pump will this fix that problem.
also what would i expect to pay for a pump???
any info wouldbe good fellas and sorry for hijacking the thread

Cheers Pickels

with some of the wound up fuel pumps it struggles to draw enough fuel from the tank, so a lift pump is added just to help fill the injection pump.
the other thing is the injection pump sucks air past the filter seals and hose connections. that can result in bubbles forming and surges and farts as the bubble goes through. its certainly not good for the pump and injectors.
ideally fix the air leaks, but they can be hard to find. fitting a lift pump will often seal up the leaks and the ones that are still open will leak fuel and be easy to find.

also for those who tend to get crap fuel and have multiable filters installed, the pumps gets rid of the restrictions the filters cause.

biggest thing is pump flow, many use small pumps. they may be 7psi pumps but they only get 2 psi because its a bit to small.

one thing being tossed about at the moment is to fit a small fuel cooler and a bypass from IP outlet back to filter inlet. that way you can use small cheap low flow lift pump and still get max fuel pressure at the IP.

can you explain more about the fuel cooler, what was its main benefits, not quiet understanding thats all..

Rhys

Rhysta wrote:can you explain more about the fuel cooler, what was its main benefits, not quiet understanding thats all..

Rhys

the idea is to recirculate fuel from IP outlet back to its inlet. this reduces the amount needed to be pumped/drawn up from the tank. not uncommon with some vehicles and fairly typical with inline pumps (trucks etc).
however rotary pumps use the fuel to cool the pump, so you need some way to get rid of the heat before putting it back into the IP. otherwise the fuel temp will increase which reduces performance and increases wear etc.

normally the tank serves as the cooler with fuel acting as a heat sink. when you run low on fuel the fuel temp goes up a bit. it shouldn't be to bad with VE pumps because of the lower flow (more time for fuel to sit in tank and cool down).

but because we are bypassing that and feeding fuel straight back to the injection pump you need some way of cooling the fuel down. a power steer cooler is all thats required. just got to find a cool place to put it.

The main reason behind the fitting of the pump is to maintain the fuel delivery to the injector pump. The factory fitted fuel line is fine for a std motor using std factory settings, but as we all do in the search for more power we play.

As we do play we reach the maximum flow potential of the fuel line, the only way to increase the flow is replacing the line with larger diameter line or pressurizing the existing line by using a pump.

The reason it has been mentioned that you should not go above 7psi in pressure, is by increasing the pressure delivered to the injector pump, advances the timing of the pump as well as increases internal pressures within the pump. Both are fine as long as you don't go mad.