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coolin the diesel with a cooler and or using pre pump before injection pump NEED HELP
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Old 26-04-2014, 11:59 AM
motojunkie86 motojunkie86 is offline
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Default coolin the diesel with a cooler and or using pre pump before injection pump NEED HELP

Im wondering if anyone has used an oil cooler or anything else to cool the diesel before it gets to the injection pump, and im also wondering if anyone on here has used a pre injection pump, in other words an intank low psi pump to supply the injection pump with cooler fuel and take some load off the injection pump, I have heard a pre injection pump can give your IP a lot longer life or even assist a worn IP......
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Old 26-04-2014, 12:21 PM
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Old.Tony Old.Tony is offline
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It greatly depends on your engine. CR engines run pumps at phenomenal pressures, with high flow rates. A lift pump has to be able to deliver enough flow so that the IP never starves (any pump in a hose is a restriction unless it's operating faster than the flow needs).

There are some people here that have two pumps, usually those that run a pair of filters and/or having an even finer filter than factory installed (fine filters are also restrictions).

As for cooling the fuel, 4WD models already have a fuel cooler but I think what you're looking for is something that cools the fuel before combustion.

Consider the scale involved here: the ability to reduce volume from a thermal change in two different substances will be more noticeable in the less-dense substance, and diesel is 540-something times denser than air. If you're going to chill something for performance benefit, do the air - that's what intercoolers are for, and there are better intercoolers out there than Nissan supply. Water to air, for instance.

If you're going to the expense of chilling the fuel so that you get more fuel in, a pressure raiser or injector duration extender would be more cost and power effective - you need motive power to drive the compressor to chill the fuel enough to get any benefit, and the chip uses a tiny amount of electricity.

If you're doing it for safety, consider something like a transmission oil cooler placed somewhere out of the way of general damage and away from the exhaust. It'll have enough flow rate to not impede things enough to bother the system.
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Old 26-04-2014, 01:28 PM
motojunkie86 motojunkie86 is offline
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its a zd30 d22, im having issues with power loss, so im covering all basis, the ute has been to a couple of very reputable diesel performance places with no proper diagnosis.

im going to add an intank pump to supply the injection pump, im thinking something around 6-7psi intank pump with a free flow valve if the intank pump fails so the injection pump can still pull up through it. it will help ease the IP and help cool the fuel.

I heard something about using coolers between the tank and IP, i have been searching and searching for info but there is very little, i know that 70 percent of the fuel gets recycled and warmed up, perhaps an oil cooler or transmission cooler would recool the fuel for the better combustion and benefit of keeping the IP electrics cool.

thankyou for the extra info Tony, do you think any of what im saying has any merit or its not worth a squirt of goats....?

it would be cheap to get a cooler and intank pump so that's why i thought its a mask up type fix :) ??
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Old 26-04-2014, 02:07 PM
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I have no idea if what your thinking will help, but surely this is a complicated solution to what surely should be a solvable problem.

Its a bit worrying though that 2 diesel specialists couldnt pin point anything.

How many kms? Could a compression test be in order?

Apart from that Im guessing youve done all the basics, Air filter, fuel filter leaks etc, cleaned/reset tps, nuetral position switch, lack of boost (turbo,waste gate related), maybe run some injection cleaner through, im running out of ideas.
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Old 26-04-2014, 01:57 PM
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The diesel returning to the tank is cooled naturally in the tank. It won't be warm/hot by the time it is picked up by the pump again.
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Old 26-04-2014, 10:07 PM
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have a look on patrol forum. quite a few use lift pumps on the zd30 engine. be aware that you have to mod the spill line.
the zd30 IP uses fuel as hydraulics to do the injection timing (like old VE pumps) so restriction on the fuel lines causes injection timing to retard. hence the common blocked filter (or air in lines) causing the 0707 injection timing fault code.

there is also a thread on coolers. they fit them on the return to the tank. bit of a gain in high temps. but thats on the patrol which has larger tanks than the navara. navara may have more to gain especially if you normally drive with half fuel tank.
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Old 27-04-2014, 09:57 AM
motojunkie86 motojunkie86 is offline
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is it a must to modify the spill line? I ask only because the diesel place here in SA that was going to put a lift pump on my navara mentioned nothing about the spill line...

is the fuel return line under much if any PSI? I wonder how much and if its better to have it in the return line or between the lift pump and injection pump?
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Old 27-04-2014, 10:13 AM
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its EXTREMELY important to mod the spill line.
the spill line is connected to the IP inlet side. ie the IP sucks fuel from the spill line, which is a good thing. but the spill line connectors on the injectors are prone to leaking. it can mean the ip sucks a bit of air in.
however if you add a lift pump the inlet line is now under pressure which also means the spill line is also under pressure. any leak in the spill line means fuel leaks into the engine oil.
diesel in engine oil causes bearings to fail, typically the turbo is the first to go.
there is a few patrols where this has actually happened. it was misdiagnosed and the replacement turbo also failed which blew the engine.

all that needs to be done is move the spill line from the inlet side to the outlet side.

a cooler is better on the IP outlet side. not being under pressure is a minor thing.
main reason is that the fuel is at its hottest. therefore the cooler will remove the most amount of heat. the 2nd thing is if on the inlet side, any air can be trapped in it causing air lock.
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Old 27-04-2014, 10:18 AM
motojunkie86 motojunkie86 is offline
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thankyou for getting back to me.

I understand your points.. thanks mate.
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Old 27-04-2014, 10:40 AM
motojunkie86 motojunkie86 is offline
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is there a different name for the spill line? as im looking for diagrams with one on google but cant find out.

found one never mind, seems its the return line from the injectors which flows back through the injection pump.... why does it flow back through the injection pump?

Last edited by motojunkie86; 27-04-2014 at 10:45 AM.
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