Asking because after a long sitting it takes my XJR 99' long time to start the engine. You must hold startet motor for at least seconds to make it run. If you turn off the engine and start again it will start immediately. Theoretically it looks like there is some valve inside the fuel system leaks and relieve the pressure and when you are trying to start after some time it takes so much time to start.
Theoretically.
I was speaking to the guys from Jags' garage and they said there is two fuel pumps. One is to hold the pressure on whole system and one just to make the right pressure on the start but i can't find somewhere in the parts catalogue that there is two pumps. Шэв find just one.


When i was looking at the catalogue i find some fuel pressure regulator


Costs a lot of money but is he does it i will definitely replace it. What are his functions in the system? He is regulating entry or out presuure? Is there any other valves or regulators inside the fuel system what can cause this problem?

 

The supercharged cars do, indeed, have 2 pumps. There is a check valve in the pump but that is intended more to keep fuel from draining back into the tank than to maintain pressure. A faulty regulator on the fuel rail can also allow fuel pressure to bleed off but the system is not intended to fully maintain pressure for more that a few minutes, certainly not hours.

A common problem with the SC cars is one of the pumps will fail and produce unusual fuel conditions.

I would suggest that a fuel pressure gauge might provide further information about what is going on.

 

Rostman:
At least in my copy of the EPM, indeed only one pump is shown in the picture, but if you drill down in the parts tabs, you will see the "QTY" for the pump item to show 2.

That has frustrated me several times in the EPC. It will only show one picture, like for the NA engine, even thought the SC engine is different. Also, it shows only the old timng chain arrangement, even though the MY 02 chains are different.

 

Why it needs two fuel pumps? Is that right that one is for cold start and other is for usual use?
I found some threads here and it looks like that a lot of people had similar problems till one day it won't start at all.
And only one decision of this issue - replacing fuel pump. But which one now? ))
I will definitely visit my Jags shop to make some diagnostics, but it is always better to understand what's going on.

 

The second pump is there to meet the greater fuel volumes required by the higher horsepower SC engine. The majority of the cost of replacement is labor cost of removal of the tank and most replace both pumps while out.

 

It is important to buy just OEM fuel pump of somebody knows who was made those fuel pump for Jaguar?
Are those pumps the same?

 

The OEM fuel pumps should be DENSO.

Many people use DENSO pumps as replacements.
The ones sold usually have a different electrical connector but the kit comes with a short adapter link harness.

Denso # 9500172
Denso # 9500183

These kits are listed as compatible replacements

bob gauff

 

On the S/C cars, pump #2 is turned on for a few seconds to pressurize the system when the ignition key is turned on.
once engine crank/turn, pump #1 is used.
Pump # 2 come on line only above a certain rpms ( believe its 3500) to supply extra fuel.
IIRC, the system can recognize if #1 had/is failing and will use #2 instead

 

Thanks guys! I will buy this denso pumps and get it replaced to be sure.

 

Damn. Official Denso product finder shows me Denso #9510008. What is difference between them? A searched with all part numbers with what bob listed and each is suitable for Jaguars but which one is better to choose?

 

Looks like i find what's the difference between all the part numbers.
951-0008 comes without filter:


950-0183 comes with filter connection from one end


950-0172 with filter connection in the middle


If photos means what is exactlly selling.

 

Guys what else is better to order from the parts to replace it when fuel tank will be out. To prevent any other issues i think it is better to replace everything in the place when you take out the tank. Some leads? Hoses?
On this picture a can see some link lead (#20)


I think it is what is melted usualy so better to have it replaced.



Do i need two of this wires? there is two options: white lead and blue lead? How to understand which one it i must choose?

Fuel pipes (#1 and #8)?


Something else?

 

As i can see from the video on youtube i need both of the link leads