Diesel fuel pump longevity.............................

With our Cruiser it blew smoke(black) when cold,once warmed up it seemed better but tail gate was always stained with soot.Also when acelerating it wasnt smooth all the way through the rev range,you'd hit real dead/rough spots.Suprisingly fuel consumption didnt change once pump repaired much.We had both injectors and pump done so symptoms could have come from either.

Hi Willem

Have been around earthmoving equiptment for years and have never seen an injector pump just kark it ,might run rough blow clouds of smoke but will keep going!. The only thing that would stop it would probably be drive failure, but thats a seldom issue. the thing that is more vunerable and will stop you dead is the lift pump. just my 2c worth!

Regards Axle.

Willie, I guess you mean the actual injector pump....that REALLY expensive b@stard that sits near the power steering box.......

But, does the Patrol have another pump down the rear end to push fuel from the tank to the filter? I've often wondered this...If so, where is it located (in the tank; I don't think so?) and what is it's life expectancy?

Cheers

Roachie

Willem, my pump went (under warrenty thank goodness). Symptoms were excessive smoke under load...like a blown petrol motor, blue and black smoke, no grunt at all, especially on hills, and when shutting off it overan a bit, like an out of tune petrol.
I initially thought injectors, had new ones put in but no change.
Turned out to be a nut in the pump that had become loose, enabling everything (timing etc) to get out of whack.
Toyota service rekkoned that it just didn' happen, that I must have been fiddling with it. I soon set them straight.
OK where has it been, musta been somewhere really rough. The highway.
Oh dear, looks like we cant get you to pay for it eh ? Too bad.
That's when I tweaked to what they were trying to get away with...about 3 grand !!
No way Hozaay !!

evening gentlemen and ladies of the opposite sex
had a look at the gu book and the only pump under the truck is the transfer pump sub to main tank
that is why it is such a mongrel job to hand prime when you change the fuel filter

steve

Willem the inline injector pumps on the old diesels, like your TD42 and the toyota 2H will usually outlast the actual engine as long as they haven't been subjected to dirty fuel, water in the fuel etc or the engine oil change periods have been neglected.
The inline pumps are cooled and lubricated by engine oil from the sump, they usually incorporate a mechanical lift pump on the inlet side, the Toyota ones have a brass gauze filter on the banjo where the fuel line comes from the tank, not sure about the nissan ones.
The later engines have rotary pumps which look a bit like a distributor on a petrol engine, they do wear out as they are cooled and lubricated by the fuel so any restrictions which cause low fuel flow (dirty filters, low quality fuel, fuel with low lubricity like low sulphur diesel) or cause the fuel to stop (like when people run their Toyota's till the engine coughs before changing tanks) lead to premature wear which causes hard hot starting and poor performance.
that is part of the reason that older engines aren't suited to low sulphur fuel, the pump internals are 'softer' which can't handle the low lubricity.
But as has been said they will rarely just kark it unless the drive from the engine is broken. there will be symptoms of impending doom ;-)

Willem, you will know when somethings wrong. The following vehicles occupants wont be able to breathe or see !!! :))))))))

Willem,

I thought the injectors were a 70-80,000km item on the Patrols - a lot of them seem to blow smoke up hills.
Wouldn't worry about the pump.

A side note that might be of interest to those who have trouble bleeding the fuel system on their diesels (mainly those with old style inline injector pumps) I came across a US defence forces bulletin to personnel who have had to change filters on Humvee's in the field.
Basically they use a handheld vacuum pump to suck the fuel through from the tank to the outlet of the filter, reconnect the line to the inlector pump (which is still full of fuel) and then start it up.
I bought one from the Aussie distributors and it works a treat, no spillage and very easy to do, the old Humvee fires right up and runs perfectly with no hiccups.
The pump is one that is used for oil sampling so is freely available.
The details are Easy-Vac Vampire pump
website is www.easyvac.com/index2.html
the model is 38x from memory and the aussie distributor is in SA, i've lost the details but contact the US on email and they will send you the details if interested.

Roachie and others who've queried it....
Patrols and many other makes do not have a pump further down the line and just rely on the pump on the engine.
If you put extra restriction on the fuel line such as an extra filter, it's a good idea to fit a simple electric fuel pump back at the tank. I did this when I fitted a Frantz fuel filter many years ago and it makes it so easy to bleed the system after filter changes etc ....Simply turn on the ignition and.....wait. In no time it has bled the system and the engine will start first try. Too easy! Don't know why they don't fit them from the factory!
And BTW my injectors have done over 200,000klms and are still good, no smoke and good spray pattern etc. (The extra fuel filter helps as it filters so well.)