TD42 Lift Pump

[Michael]

Fanus, my Patrol het nou 260,000km op, maar omtrent 20,000km na ek die engine oorgedoen het

[petrol]

Fuel starvation or especially fuel starvation after it stood for a day is forsure a leak somewhere in the supply fuel line and that is 9 out of 10 the fuel pressure regulator on the 4.2 diesel pump. That pressure regulator gets set by tapping it with a steel rod while you have a fuel pressure guage installed(not that easy). I normally do it while the engine is running, tap the fuel pressure regulator slightly until I can hear the engine idle go up slightly.

Trust me no lift pump needed, wasting time and money.

[Michael]

Hi Martin

Im not sure a 4.2 diesel has a fuel pressure regulator, if it does I dont know where it is.
As far as I know it just sucks the fuel from the tank and supplies it to the injectors which then pops at the set value.

[ricster]

The fuel pressure regulator is a mechanical regulator that is usually connected to the side of the common rail. The TD42, as far as I know never came out with a common rail fuel system. I stand corrected on this but I think even the TD42T that came standard from Nissan, with a turbo was old school injection and also not on a common rail.

[petrol]

Hi Michael

Hy het verseker en ja niemand weet van hom nie.

Hy sit links voor bo op die pomp.

Ek se weer as jy sukkel met lug in jou brandstof pype en jy kry nie die lek nie dan is dit verseker die brandstop druk beheer wat bo op die pomp sit.
Dit het my 2 jaar gevat om die lug lek te kry op my 2.7 diesel wat dieselde is as die 4.2.

Groete

[petrol]

Oeps jammer hy is aan die regterkant bo op die pomp.

Hier is n prentjie

[petrol]

Die middelste gedeelte word dieper in gekap, hoe dieper hoe meer druk, wees versigtig as jy hom te diep inkap dan moet hy vervang word.
Dit is sy O-rings wat begin lek, en in myne se geval het hy hom self so n bietjie uitgewerk toe het die lug vanaf die return pyp na die tank terug gekom.
So m.a.w. as hy nie reg is nie suig hy lug van die tank af en sodoende loop al die brandstof in revers terug tank toe, dan kry jy lug in jou brandstof pype.

[petrol]

In die youtube video wys hulle tussen 1 min en 50s tot 3 min 30 sec hoe om die diesel druk op die diesel pomp te stel.

https://www.google.co.za/url?sa=t&rct=j ... 5IpYV482Ow

[Michael]

Martin, that is very interesting.
I will see if I can find mine on the pump and see if I can adjust it.

Thanks for the youtube clip

[petrol]

Only a pleasure, this made such a big difference on my 2.7.
Everybody know that more fuel pressure relates to better fuel spray and better fuel spray means better an quicker combustion and that means more power and better fuel economy.
I also wasted time and money on a lift pump to find the culprit a week later.