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(Post Link) post #1 of 14 Old 28-09-14 Thread Starter
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upgrading lift pump jtd

I'm thinking about upgrading the lift pump on my 156 2.4 jtdm.
Anybody done it before?
I'm looking at a walbro 255 , but its body is only 38mm wide , while my current one is 51mm.
Could i use somekind of sleeve to fit it?

Also would i need an extrernal fuel pressure regulator? There is a mechanical ball spring fpr mounted on top of the fuel filter.
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The walbro will flow more than double the oem pump. Imho the FPR return nozzle will not be capable to handle it.
See my original GTV FPR return nozzle (2mm dia) vs AEM FPR (biggest nozle 6,35mm dia)

fpr.jpgaem fpr.jpg

You can test it quite easily. Upgrade the pump, switch the key on and measure the fuel pressure at the tank output. If it will be increasing over the FPR rated pressure, return nozzle simply can't handle all the flow.

Last edited by yan.ko; 28-09-14 at 15:51.
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it doesnt really have a controlled fpr , just a check valve banjo like this.
I could take that out and use an external fpr , but i would like to keep it simple

als I saw you had some trouble fitting the 044 which has a 60mm body to big for my assembly , but most pumps are 38mm which is to small.
Can I just use a foam sleve to thicken it?
Won't diesel disolve it?
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Anyway, I don't see much reasons for upgrading the lift pump. Once the fuel reach the high pressure pump, it will suck it out of tank. (suppose the intank/lift pump is freeflow so to speak).
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the problem is my original pump doesn't supply enough.. could be because its worn , but its only done 160.000km.
It was defenatly an upgrade from the previous one that did 330.000km.

I think it wouldnt hurt upgrading to a walbro 255, which is half the price of a new original pump
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I thought walbro's work only with gasoline , not diesel fuel?
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not going with a walbro , although they should be fine .
diesel is about 15% thicker then petrol , so you could say roughly 20% less flow.
I ordered one that could specificly handle diesel , and also have a custom sleeve made so it'll swap right over with the stock pump.
Not sure which brand it is, but should pump diesel at 250lph
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Not sure which brand it is, but should pump diesel at 250lph
but that depends on the pressure it gets delivered. petrols deliver 3 bar above manifold pressure and the rated capacity should therefor be considered at 3 bar. What does the CR pump expect?
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250 is free flow , about 130 at 5 bar
i'll need about 110 at 3,5 afaik.
I was hoping to pick it up yesterday , but he had gotten the 60mm version instead of the 38mm version.
He was going to check if he could make the 60mm one fit.
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It will make the pipes leak at the joins and foam the diesel up. That should give you premature pressure pump failure. It may even over stress the pump wiring?! What do motorsport diesel engineers do?
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No it should be fine , the guy building my pump has used one for years now.

I am thinking about a "hotwire kit" like this.
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Cool, thats good to know. So you don't think you'll need a regulator then?
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you do need a regulator.
I ordered this one;

it will replace the ballspring banjo bolt on top of the fuel filter
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Quote:
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the problem is my original pump doesn't supply enough.. could be because its worn , but its only done 160.000km.
It was defenatly an upgrade from the previous one that did 330.000km.

I think it wouldnt hurt upgrading to a walbro 255, which is half the price of a new original pump
the lift pump shouldn't be worn out at that mileage though, since it's all the time submerged in it's own coolant and lubricant. Of course, if the fuel used isn't as lubricating as required that's another matter.

I see a lot of premature failing injection equipment parts as well, notably piezo injectors are vulnerable (a lot of them die within the first year, usually taking the engine with them) but also old distributor pumps and other stuff.

I have serious doubts if the fuel we buy has the lubricity required. Certainly, the added biodiesel alone is not enough to guarantee adequate lubricity.
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