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Matt
Matt, Mechanical Engineer
Category: Toyota
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Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a Nissan navara 2005 2.5.the fault is the engine sometimes

Customer Question

I have a Nissan navara 2005 2.5.the fault is the engine sometimes stutters when under pressure .ie up hill.we have changed the fueal filter and added some stp injector cleaner.any idears please
Submitted: 2 years ago.
Category: Toyota
Expert:  Shantal-Mod replied 2 years ago.
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Expert:  Matt replied 2 years ago.
Hello

this sounds like it may have developed an air leak on the fuel supply pipe from the tank to the engine. The engine has no separate lift pump and relies on the built in one in the injection pump. If a leak has developed on the fuel suction pipe then air entering the system will air lock the pump.


Try pumping up the fuel using the hand pump in the engine bay on the filter housing, then crack off / loosen each injector pipe in turn while cranking the engine and getting an assistant to operate the primer. This will expel air from the injection side and the engine should fire up. The problem will be cured by checking the supply pipe along its length for signs of leakage and repairing any you find.
If you daub each pipe joint with heavy grease and the issue goes away then wipe the grease away one at a time to highlight the problem joint

also try loosening off the gas filler cap as there's a 1 way valve in it to let air in as the tank empties

the valve can stick shut creating a vacuum inside the tank

if the issue goes away with a loose filler cap then replace it

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