Made in USA 12V diesel pumps
- Thread starter chris snell
- Start date
I drove around for a long time in my 300 Tdi with a bad lift pump. Intermittently I would have a very long crank from it losing prime. The sad part is that I had a spare $12 lift pump in the truck and just took forever to install it (didn't realise that was my problem).
I'd rather rely on the mechanical pump than the electric one. They are easy to replace and super cheap.
I'd rather rely on the mechanical pump than the electric one. They are easy to replace and super cheap.
Sorry, but that's just not true for many situations. That may be true if you have no air leaks but if there is air coming into the system, you can crank all day. The 12V pump will at least let you get it home if there is a small leak.
In my experience, there are varying degrees of fuel feed problems. When my mechanical pump went bad, it would take a bit of cranking to start and then would die under load. I also had a few air leak issues that kept it from being able to prime properly.
copleymotorcars
Well-known member
as chris said, the mechanical pump can fail in different ways. when mine failed, the engine wouldn't run at more than idle. literally idle.
i also disagree with the statement that "crank it for 5 seconds, and its bled". maybe if the injection pump still has perfect prime, and all you've done is change the filter or similar. if the fuel system has any more than the smallest amount of air in it, no chance.
i'm all for keeping things simple, and i, too, fought the notion of the electric pump for some time as i didnt see any issue with the diaphragm pump. but now that i've changed, its just a better solution.
i also disagree with the statement that "crank it for 5 seconds, and its bled". maybe if the injection pump still has perfect prime, and all you've done is change the filter or similar. if the fuel system has any more than the smallest amount of air in it, no chance.
i'm all for keeping things simple, and i, too, fought the notion of the electric pump for some time as i didnt see any issue with the diaphragm pump. but now that i've changed, its just a better solution.
AdamSanta85
Well-known member
It took one attempt of changing my fuel filter using the lift pump priming handle to realize there is a better way...
You don't need to use the priming lever.... The system is self bleeding. That is what people are not comprehending. Just crank and it will bleed. No problems. If you really want to bleed it, then crack the bleed nipple and crank.
I run dual tanks and run the first one empty regularly. When it starts to die, swap of to the other tank and few second later it is back to normal. People overthink these things.
Like I said, VW did not even use a lift pump. There was no priming instructions. Run out of fuel, fill up, crank engine until it starts.... Change fuel filter, crank until it starts.
AdamSanta85
Well-known member
I was in a huge LR club in the years that the 300TDI trucks were new. Lots of people had them. I have no recollection of anyone ever having a problem with the lift pump or any fuel supply problems. Nobody ever carried spare lift pumps. It is not an inherent problem nor a bad design. I can only assume that replacement pumps are junk and/or people doing conversions are not properly ensuring the fuel lines are secure and leak free.
There is nothing really wrong with an electric pump, but it does nothing to increase reliability. If you are doing it to get around a leak in your fuel system, it is a bandaid and you should fix your truck properly..
There is nothing really wrong with an electric pump, but it does nothing to increase reliability. If you are doing it to get around a leak in your fuel system, it is a bandaid and you should fix your truck properly..
LazyRabbit
Well-known member
Its probably rubbish replacement pumps for the most part.
This guy just posted a video on how low quality replacement parts plaque the land rover market, unlike toyota.
https://www.youtube.com/watch?v=XbgH4EnH6zI&t=795s
Is there any harm at all in running both types simultaneously? This is my plan and hoping it adds some additional reliability through redundancy. A failed lift pump is the only failure that has kept me from getting home under my own power (knocking on wood now).
This is the 12v pump I plan to install this weekend. It will be just after a new Robert Davis all metal sedimentor.
Airtex E8251 Universal Solid State Electric Fuel Pump for Marine Applications https://www.amazon.com/dp/B0027I88VQ/ref=cm_sw_r_cp_taa_foM2BbX9NKWAD
Wow, big price drop on this...maybe I'll buy a 2nd as a backup.
Sent from my P027 using Tapatalk
This is the 12v pump I plan to install this weekend. It will be just after a new Robert Davis all metal sedimentor.
Airtex E8251 Universal Solid State Electric Fuel Pump for Marine Applications https://www.amazon.com/dp/B0027I88VQ/ref=cm_sw_r_cp_taa_foM2BbX9NKWAD
Wow, big price drop on this...maybe I'll buy a 2nd as a backup.
Sent from my P027 using Tapatalk
The mechanical lift pumps are definitely shit quality and fail often, but I'd rather rely on that than have an aftermarket electric pump.
WreckITFrank
Technical Excellence Contributor
Just to be clear, a 12V pump is not needed to run a sedimenter on a stock D90, 200tdi system, correct? No change in pressure or loss from something else inline...
AdamSanta85
Well-known member
Correct. Some Defenders came factory with sedimenters (Older 110's?)
AdamSanta85
Well-known member
No, been running like that for a couple years now. All good, truck runs strong.
WreckITFrank
Technical Excellence Contributor
Thanks, Im probably going to just do it all anyway, plump in some parker hose from tank to the IP, with sedimenter, diesel pump, and new filter. Figured it worth asking though.
This is a great thread, some good knowledge gained here, Thanks all.
NPT90
Well-known member
From my research there is a possibility of the lift pump rupturing and spilling diesel into the engine oil.
I cannot speak to the LR lift pump design though, I havent seen anyone have this happen so perhaps they are differently manufactured then Mopar units.