Hello, I'm hoping to tap into the knowledge of the Jaguar forum members who have been through a similar issue:

I'd like to upgrade the in tank fuel pump in the fuel sender assembly, I would much prefer to fit a pump that would have some spare pumping capacity over OEM. This is a pic of the pump from a salvage tank from the same year and model, The numbers 303 a16607g are on the pump sides. What is a good OEM replacement for this and what is a good pump with a bit more pumping capacity than OEM please ?

I have a supercharger top pulley 2.5lb pulley upgrade and a remap, 200 cell cats and a X pipe crossover free flow exhaust fitted.
The car performs quite well but occasionally flashes out a both banks lean code after a WOT (wide open throttle), hence the need.
Car will not be driven until pump is replaced / upgraded.

I have attached a picture of the fuel pump: https://i.imgur.com/lVHoMUZ.jpg
The Jaguar part number for the Fuel Sender Unit is C2P9749 as far as I can see online. Any help appreciated.

 

Sorry but what made you think that stock pump isn't up to task? Our oem pumps are plenty , Im pushing over 500 crank hp and stock pump keeps up and has room for more..

 

As I said in the first post in the thread. I'm running lean with codes to prove it (at 520bhp) . I'm interested in slotting in a pump that can push 20 percent more litres per hour. Has anyone done this yet or even has a guide to select a pump to achieve this?

 

My crank hp is at around 511 and pump has plenty of room still. I would like to see some dyno sheets or track time to back your claim of 520

 

Good to know as there would be very little fuel flow differance between both of our BHP figures, Thank you Alex.
I'm still inclined to find and fit a fuel pump with more headroom if anyone on here has found one ?

OK found out that the number A2C53083451 is from the manufacturer VDO. I'm as of yet, unable to find out the specification of this pump, or even what an upgrade option is.
I would love to find a pump that just slots in with a bit more spare capacity.

It is possible to buy the OEM pump separately from the OEM fuel sender unit, as I found a guy in the Ukraine is selling them, and showing the VDO box that it came in, complete with VDO part number sticker.

 

Can't you just run any aftermarket pump between the tank and engine that has a higher flow rate? Doesn't seem that hard, really. No need to mess with the tank or most of the lines that way.

 

no! Once again these cars are built with specific systems that have certain characteristics that are used to adjust other characteristics. And regards to the fuel system, there is no return line to the tank. The fuel pressure is monitored near the fuel rail and depending on your Rpm, load, and the ambient pressure and the temperature and furl pressure and it’s throttle position etc it turns the pumps on and off in the tank to give the optimum fuel pressure. If you put in an in line Pump you missed that system up. Feedback will not be correct and I think you’re open up a can of worms.

 

Still waiting to see those power numbers though 🙂

 

I have seen a few of the guys running twin screw set ups on the 4.2s just upgrade their injectors to higher cc and Pro M MAF and its able to keep up. They end up making over 500 at the wheels without changing the fuel pumps. It would be good to get a dyno run with afr readings to see what the issue could be and where on the power curve its leaning out.

The other thing a member recommended me was a Boost-A-Pump which increases the flow of your stock pump. One of the guys ran one of these from the GT500s on his XJR and it gave him what he needed.

 

Exactly my point our cars have plenty room unless his tune is runing super pig rich 8.1 and maxing everything out

 

I have had a similar issue in that I have received lean fuel codes. I had the plugs changed and the injectors cleaned at the same time, which cleared it up. Mine is also an 07, but without any mods. May not be the same scenario, as I didn't have the codes flash after WOT, but rather during the course of in-town commuting.