B

bucks4x4

Member
Help please
Both me and my mate both run td5's but he's having trouble
His sender unit/pump in fuel tank keeps running it does eventually time out he's changed sender then he thought it could be injector seals so changed them and the copper washers but not that still same
I have a nannocom but don't know how to use it lol
Could it be used to check for faults regarding this if so could anyone hive me the idiots guide on how to use it
Thanks in advance
 
bucks4x4 said:
His sender unit/pump in fuel tank keeps running it does eventually time out he's changed sender then he thought it could be injector seals so changed them and the copper washers but not that still same
Click to expand...

Sorry , what do you mean "his sender unit /pump keeps running"?

Cheers
 
First of all the fuel supply system is not covered by diagnostics though i dont understand what's the problem, the pump is supposed to keep running with ignition on for 3 minutes (eventually with short pauses)
 
It keeps running with engine not running
I mean the sender unit in the fuel tank with a fuel pump attached to it
I don't know weather it is called sender unit or fuel pump
 
Well his is making a loud noise while running mine doesn't seem to do it
What do you mean eventually eith short pauses
 
short pauses in running only with ignition on II or during the purge sequence without engine running ... if the pump is aftermarket or on it's way out it can be noisy
 
Has it always made this loud noise?

to find out if the problem is his pump, why not pull yours and his and swap them out with each other.

Have you checked the relay? if it is running all the time?

Cheers
 
sierrafery said:
and what's the problem? the engine is not starting or what?
Click to expand...
No engine runs sweet just thought with it making a noise and running all the time it had got a fault because mine doesn't do it but it is really loud as though the pump is going into overtime as though it had got a diesel leak but it hasn't could it be somesort of pressure switch thats making it pump diesel round and back to the tank
 
While the engine running the pump is supposed to run together with it...or do you mean is it running after the ignition is off?...about the noise i've already said
 
Blood from a stone......the in tank pump runs all the time and as said if after market can be a bit loud mine is but it will shut off after a few mins if you don't start the engine I don't think you have a problem at all.
 
Have you checked filter on intank fuel pump it will keep running if it can't pressurise fuel system propperly i have had this and it eventually burnt fuel pump out because filter was blocked.
 
bucks4x4 said:
It keeps running with engine not running
I mean the sender unit in the fuel tank with a fuel pump attached to it
I don't know weather it is called sender unit or fuel pump
Click to expand...
Just to put you right about what things are in the back end of your D2. Generally, the "sender unit" is the device which measures the level of the fuel in the tank and ultimately operates the fuel gauge. The device which does the work is the "fuel pump", or rather the two fuel pumps. There is a low pressure pump and a high pressure pump built into the fuel pump unit. It's more probable that the noise is created by the high pressure pump. The D2 fuel pump contains both pumps and the sender unit.
Unlike many earlier diesel engines, the Td5 doesn't have a lift pump on the engine to feed the injectors, they're fed with fuel at the high pressure required for the Td5 injectors on a "common rail" system directly from the high pressure pump in the tank and any unused fuel is fed back to the tank on a return pipe.
 
brian47 said:
....or rather the two fuel pumps. There is a low pressure pump and a high pressure pump built into the fuel pump unit. It's more probable that the noise is created by the high pressure pump. The D2 fuel pump contains both pumps....
Click to expand...
I hate to contradict you but i must cos the bolded parts are wrong ... it's only one double circuit pump which is specially built to work in two stages, like the one in the link https://www.ebay.co.uk/itm/In-Tank-...603295?hash=item25e075c05f:g:G1QAAOSwnwZZwSng it ''boosts'' up the LP to HP inside

from RAVE:(with the only correction from real life that the HP goes up to 5-6 bar that's why the regulator is there to make it 4)
The two stage pump comprises a high and a low pressure stage. The low pressure stage draws fuel from the swirl
pot through the filter. The low pressure stage pumps fluid at a pressure of 0.75 bar (10.9 lbf.in2) and a flow of 30 litres/
hour (8 US Gallons/hour) to the fuel filter. A proportion of the fuel from the low pressure stage also passes, via a
restrictor, through a jet pump which keeps fuel circulating in the swirl pot. The high pressure stage draws the low
pressure fuel from the fuel filter and pressurises it to a pressure of 4.0 bar (58 lbf.in2). The pressurised fuel is then
passed from the pump to the injectors at a flow of 180 litres/hour (47.6 US Gallons/hour). A fuel pressure regulator is
located at the rear of the engine and ensures that the delivery pressure remains at 4.0 bar (58 lbf.in2) by controlling
the amount of fuel returning to the fuel tank.
 
sierrafery said:
I hate to contradict you but i must ... it's only one pump which is specially built to work in two stages, like the one in the link https://www.ebay.co.uk/itm/In-Tank-...603295?hash=item25e075c05f:g:G1QAAOSwnwZZwSng it ''boosts'' up the LP to HP inside

from RAVE:(with the only correction from real life that the HP goes up to 5-6 bar that's why the regulator is there to make it 4)
The two stage pump comprises a high and a low pressure stage. The low pressure stage draws fuel from the swirl
pot through the filter. The low pressure stage pumps fluid at a pressure of 0.75 bar (10.9 lbf.in2) and a flow of 30 litres/
hour (8 US Gallons/hour) to the fuel filter. A proportion of the fuel from the low pressure stage also passes, via a
restrictor, through a jet pump which keeps fuel circulating in the swirl pot. The high pressure stage draws the low
pressure fuel from the fuel filter and pressurises it to a pressure of 4.0 bar (58 lbf.in2). The pressurised fuel is then
passed from the pump to the injectors at a flow of 180 litres/hour (47.6 US Gallons/hour). A fuel pressure regulator is
located at the rear of the engine and ensures that the delivery pressure remains at 4.0 bar (58 lbf.in2) by controlling
the amount of fuel returning to the fuel tank.
Click to expand...
Yep, I really meant it was a two stage pump rather than two discrete pumps, but the general principle which I was trying to explain in simple terms still holds. For the sake of simplicity I left out the bit about the fuel pressure regulator feeding the injectors and diverting the unused fuel (over pressure release) back to the tank.
 
Thanks fellas he thought he had got a problem with his pump because it was noisey and running all the time with ignition on but engine off
So he bought a new pump and fitted that still noisey thats when he thought injector seals might be u.s allowing fuel to keep pumping back to tank so he took injectors out and replaced seals and copper washers but its still noisey so after all that it seems as it's just because it's an aftermarket pump because it stops after 3 mins
But with the noise it's making it didn't seem right but thanks for your help
 
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