Supplying constant pressure to a diesel fuel pump

Some one on here has done this or was talking about it not long ago,did you do a search.
I am also thinking about doing it,believe that they said it actually improved economy abit.

SantaAus
Have known a guy to fit one to mitsubishi 2.8 , It also helped it as they have a small lift pump at the rear of the injector pump and can weaken at high ks. A lot of diesels have a pump to deliver fuel from the tank to the injector pump via the filter. Not sure but i think nissan have a different system.

Axle.

do a search on this site roachie has recently done it to his 4.2td

steve

Did it a couple of years ago on my TD42 and have been very happy with the results.
I have a Frantz on the fuel line and an electric pump back at the tank. Priming the fuel is now sooo easy..... Turn ignition on, open a bleed screw, and wait for fuel to spurt out.
Don't know why I ever tried to do it with a hand pump!!

This is a common addition amongst the vege oil brigade who use a low pressure pump to push the fuel through the filters, which apparently work better under pressure than suction. Not heard of any detrimental effects.

I wouldn't put a high flow/pressure racing pump on, but I guess you could. The idea is to simply keep a nice solid pressure up to the pre filters and consequently let the lift pump not work as hard sucking. Can't see it having any impact whatsoever on performance unless there was a prior problem - such as fuel starvation.

They are around $100 in Supercheap and other suppliers. I've got one waiting in my 'to do' box.

Tim

sounds like a great idea, I would imagine it would take a little of the strain off the mechanical pump as mentioned above..and it cant hurt.

better get my leaky CAV filter seal fixed first (as per Roachie's)

Cheers

Rev

Have just bought the pump. Its a "Fuel Flo" part no. 020.
Will post up some information about the install when I have it done.
SantaAus

Now I'm not sure about this and happy to be corrected but there is a safety issue with wiring this additional pump into the accesory or ignition switch. A fuel injected vehicle's fuel pump is usually wired via a relay that stops fuel flowing when the engine is not running even if the ignition is on. This reduces the risk of fire in an accident when an engine may stop (say through a ruptured fuel line) but the ignition remains on. It's not hard to imagine what destruction would take place with fuel poring out via a pump with no load. I agree that the possibility of this happening with diesel is less but the scenario is worthwhile considering

I've had a quick look at the way the ChevTrol fuel pumps are set up. The original Nissan fuel pump now does nothing other than pump fuel from the sub-tank to the main tank. NB - this has to stay there as the sub-tank is lower than the main tank.

The new Carter pump fitted by Brunswicks now does the total duty of pumpimg from the main tank to the high pressure rotary injection pump.

However, I'm not now gonna rip the lot out and start again. I've gone and bought a 100 litre black plastic tank that I'll use as a long range tank and it'll be fitted with ANOTHER electric pump to transfer fuel from the this LR tank to the main tank as I drive along - just like me old Mav did.

Might fit another battery (that'll be number three!) just to keep all these bluddy pumps going!

That'll give me -let's see - about 95 plus 35 plus 100 litres = 230 litres of fuel. That makes me ChevTrol a flying bomb!! Good job it's diesel and not petrol!

To fit all me prospecting gear in, I've taken the 3rd row seats out, I've taken the 2nd row seats out. If this keeps up I'll be taking the driver and passenger seats out!

Bilbo