Diesel Lift Pumps - Useless Informatio Untill You Need It

Joc

Well its something like that.

Firstly - The Rotary pump on the Troopy 1HZ motor does indeed feed excess fuel back to the tank and does a damn fine job of it.

Secondly - The aforementioned pump is a lift pump and has this 'low presure' facility which is allegedly set/adjusted by the pump techo's (So I have been told and verily believe)

Thirdly - It is further alleged that the said lift pump thingy setting, controls the maximum amount of fuel that the 'high presure' (injectors) side of the pump gets.

Fourthly - No amount of extra devices between the tanks and that lift facility is going to change that maximum fuel inlet setting in the lift pump.

Now in my case the good old 1HZ was hitting a 'brick wall' at 3000 rpm even with an after market turbo.

So the fix ended up being the following:

(1) Remove the OEM twin filter pack

(2) Replace with CAV agglomerator pack and filter pack. Problem solved.

Having read about Mr MUSTHAVE Everything and Anything for and on his Nissan ie Roachie, having some facncy extra in line fuel pump to fix some inadequacy with that thing he drives, I thought I would check it out. (always looking for that little extra something)

The guy I spoke to gave me the above drum and said I would be wasting (in my circumstances) good money chasing something that was unattainable other than having a pump techo 'crank' the pump up a tad or two.

Other makers vehicles maybe different the way they work, its just something that maybe of interest to others.

Cheers

K

Hey Lucy, you drop-kick.......

I didn't fit that new 12 cylinder lift pump to get anymore neddies out of the already massively powerful TD42TD donk....only fitted it to ensure there was adequate fuel "available" to meet the OE pump's hungry demands. I read on this forum where if you fit a larger tank (ie: more vertical height for fuel to overcome) and/or if you fit additional filter/s etc (ie: more "resistence" for the OE pump to overcome)......then this extra little bit of whizz-bangery may just be of some assistance. For the sake of less than 100 bills, I thought it was a reasonable investment. It also overcomes any issues of a slight air leak within the system (like what occured on mine when the seal at the bottom of CAV was a bit less than 100%).
Now, you'd better get back to that bucket of rust of yours and continue to try to make sure it's ready for it's overseas journey!!!! ;-))

Cheers

Roachie

You! Sir

are nothing more than a Nissan driving/owning Neanderthal.

Always thought the lift pump was the hand/thumb pump that primes the diesal injector pump

Davoe,
The one you speak of is (AFAIK) called......wait for it......the "priming pump" ...haha

Most diesel injector pumps (I'm treading on eggshells here cos I surely ain't no expert) have a "lift-pump" fitted to them. The lift pump's job is to draw the fuel from the tank....then the injector pump forces the fuel under considerable pressure, into the donk. Some vehicles have a "lift pump" in or near the tank. The Patrol doesn't have that and I just wanted to put in this little 3psi pump to help get the diesel up to the front of the truck and through the filters etc.

I'll stand corrected if/when somebody with more knowledge chimes in with a correction....;-))

Roachie

Site Link

Here is a piccy of the pump......

Its not often that you make sense Mr Roach but this time you are spot on the money.

Couldn't have elucidated it better myself.

Can't believe I just wrote those two lines either. (LOL)

Drop kick ROFLMAO

Neanderthal ROFLMAO

Its gunna be a fun overseas trip I can see that hahahahha

OK as I believe it in my 2H, is that the hand priming pump is a manual operation of the normal lift pump to help with bleeding the system if it becomes empty, it is mounted on the side of the lift pump, anyway it works ok if I need it LOL

Cheers Pesty

Now don't you worry about that young fella - The O/Seas trip will be just fine as I have been to the 'clinic' and had my anti Nissan driving Neanderthal shots and have been issued with heaps of back up booster pills (not pumps)

Now back to business at hand

On the the 2H is the pump an inline pump or rotary.

The inline pumps are the ones that usually have the priming device on/at the pump whereas the rotary ones (from what I have observed - can be corrected) appear to have a priming arrangement away from the pump - usually somewhere near the filter pack.

The actual 'lift capacity' once again being a low pressure facility on the entrance side of the pump.

Firstly I wont need anti nissan pills as Ive grown a natural imunity to them, secondly we out number them for O/S trip anyway, 5 - 6.
BUT we should be worried about sinking as we are on the same boat as the 4.5 ton trol!!!

Now, yes inline pump, and low pressure lift/hand pump unit is on the side of the injector pump.

Cheers Pesty