The lift pump on my disco 200tdi failed yesterday, but it failed in a way I have not seen before, see the video below. Usually when they fail the internal diaphragm fails and it stops pumping, not the casing failing and it just pumping fuel out of the side. I will remove it later this afternoon and inspect further but is the quality getting worse? This is a delphi (all I ever fit) and has been on the engine about 2 years and done about 40k miles. Is this just the norm now. When I was running veg oil I used to carry a spare but thought with straight diesel they should have a longer life expectancy.
Are lift pumps getting worse?
- Thread starter dag019
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Flossie
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I gave up with them years ago. I use a facet 4psi pump, hole in the block capped off.
The quality of everything is getting worse. That's not a cynical opinion, it's a fact documented by consumer watchdogs, vloggers, bloggers, and the media. So it wouldn't surprise me if the quality of modern diesel pumps is now crap.
So no diesel pump at all? How does the pump regulate the flow like a proper pump?
Flossie
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Correct. 4psi is the max pressure the pump can make against a dead head. It ticks away for a few seconds just before starting the engine then stops. I never hear it when the engines running. Makes bleeding the fuel system a doddle too. I fit 1/8" bsp male to 10mm compression fittings to each side of the pump and cut the fuel line to fit it. Fuel line is 10mm. I stuck mine in the toolbox compartment under the drivers seat in my 110 (rear tank), I then extended the fuel line straight to the filter using clear 10mm nylon tubing from a pneumatics place, not really clear but clear enough that I can see fuel moving through. I also fitted the clear tubing from the filter to the fip. Usefully when fault finding. I had to modify the filter banjos to do that though.
SimonBrown
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My 110 has a Isuzu 2.8 engine and that has no lift pump. The Bosch VE rotary does the job once primed and for purging air there is currently a rubber bulb on the fuel line to be squeezed.
I cant say I was a fan of the rubber bulb and was thinking a small electric faucet pump down by the fuel tank would be a good idea. So a 12v feed into the wiring diagram was incorporated in ancipation of fitting one.
Its comforting to know its been done, albeit to replace a lift pump.
tottot
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I have done the same you Simon on my Ford Focus 1800tdci, bulb makes bleeding after filter change a doddle as before it was a nightmare job. John.
That's how my setup is at the moment.
Would be nice to replace the mechanical pump but then you have the timing to consider if you remove the mechanical pump. Shorter belt? Idler pully? Seems a bit of a headache unless you leave the mech pump in place.
tottot
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The lift pump runs off a cam on the cam shaft, nothing to to with belts or idler pully.
Lift pump and injection pump are two different things.
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