I posted up a request for info on a Daihatsu forum but because I also asked if anyone had a tow hook for sale I was banned for a month for not using the buy/sell page. It seemed a bit severe so I thought I would return to the warm friendly STW.

My fuel pump leaks when I rev. See the video. It is a Daihatsu Fourtrak 2.8 TD and probably uses a pump similar to Toyota. Any suggestions welcome:

No idea, but based on a previous Freelander and (both pumps failing) check that the injectors haven’t been ‘over-compensating’ and are also goosed.

How I posted nothing is impressive…

I’d call feather diesels in Yorkshire they’re very good and helpful

Whats under that cap?

Can’t really tell what the pump is from that video…

But going by location on the pump I’ll take -some one **** with the boost diaphragm to make it go quicker for 5.

Cause them things were dog slow for a 2.8td

These are the best people I know of for diesel fuel pumps in the South

https://www.yell.com/biz/poole-diesel-poole-152297/

M&B Diesel recon a leaky boot pin but want £180 plus vat to fix which seems steep compare to recon pump prices.

How hard can it be to replace one of them?

M&B Diesel recon a leaky boot pin but want £180 plus vat to fix which seems steep compare to recon pump prices.

Id imagine they would be doing a full over haul for that kind of money and not just changing the boost pin and diagphragm .

It’s not hard to change but if you get the clocking wrong it’ll smoke/over/under fuel like a mad un

When I did mine I was able to use the old one as a reference as I knew it hadn’t been **** with.

Yeah – just watched a dozen videos on swapping the pins. Mark the diaphragm against the body. Mark the pin against the diaphragm. I will go for like for like replacement I think. Then maybe plan with spinning the pin 90 degrees for more power once I get it basically working right

Mark the diaphragm against the body. Mark the pin against the diaphragm. I will go for like for like replacement I think. Then maybe plan with spinning the pin 90 degrees for more power once I get it basically working right

All of that assumes it was stock when you started shirly

The boost pin and diaphragm won’t have any affect on a diesel leak though? That side of the system is clean. The boost pin just acts on the end of the max fuel pin which will be under an antitamper device down on the side of the pump. This piston controls the actual flow of fuel into the pump (the boost pin just controls when and how fast it opens relative to turbo boost pressure. It could be one of the seals on that max fuel pin that have perished, but that is definitely not a part of the pump you want to be getting into at home.

My boost diaphragm being burst was pressuring the fuel tank and pump was leaking.

Quite common on Lucas pumps.

Can’t see what that pump is though.

Although it should be clean if the diaphragm is split it can be allowing the pressure differential into the fuel system when it’s split.

Pattersons diesel in Cowdenbeath.

Well that didn’t goes as expected.

I took the top off the fuel pump, only dropping one allen key into the depths of the engine bay, marked the diaphragm against the pump body with a marker pen and removed the diaphragm and attached boost pin to reveal this.

I removed the spring to clearly see the whole the fuel was leaking from and it is the black plastic hole on the other side of the pump.

For fuel to be dripping out of there it must be getting into this top part of the pump where it doesn’t belong as WelshFarmer said. The boost pin looks clean and undamaged which means it must be the seals around it that are letting the fuel through.

With a sad heart and £180+vat bill looming I put it back together carefully aligning the pin and diaphragm with the markings I made. I started it up to make sure it still ran and looked at the drip – IT HAD GONE. I revved the engine and nothing, not even the smell of diesel.

I am guessing some crap from dirty fuel had got sucked in and was stopping the pin seal properly or something. Whatever, I don’t care. I fixed it. I am claiming the win!

Wca. Diesel specialists 😉