Save up to 15% with Adrian Flux insurance!

Technical fuel filter

Currently reading:
Technical fuel filter

D

darcie

New member
Joined
Aug 4, 2017
Messages
18
Points
10
Hello All Am New to this site so please be Gentle :D:D I bought a doblo 4 months ago 1.9 JTD 54 iv'e done oil change oil filter. I want to change the fuel filter does can any 1 can me what the white plastic screw cap is on the New fuel filter I just bought from fiat the reason am Asking is the 1 that's on as a sensor on the bottom I haven't taken the old 1 off yet am thinking the sensor on the old filter screws off and screw on the new filter please correct me if am wrong? am thinking the white plastic screw cap is for models without the sensor? for the Water cheers chris your help is valuable :worship:
 
darcie said:
Hello All Am New to this site so please be Gentle :D:D I bought a doblo 4 months ago 1.9 JTD 54 iv'e done oil change oil filter. I want to change the fuel filter does can any 1 can me what the white plastic screw cap is on the New fuel filter I just bought from fiat the reason am Asking is the 1 that's on as a sensor on the bottom I haven't taken the old 1 off yet am thinking the sensor on the old filter screws off and screw on the new filter please correct me if am wrong? am thinking the white plastic screw cap is for models without the sensor? for the Water cheers chris your help is valuable :worship:
Click to expand...

Hi,
Welcome to FF.


Yes, normally the water detector just replaces the plastic drain plug that comes with the new filter.
You are also correct that the detector is for water that collects in the filter.


Robert G8RPI.
 
The white plastic cap has the new washer on it as well, don't be tempted to just remove the old sensor and screw it back onto the new one as I did......it leaked as the seal was slightly perished....I changed it over and solved that leak.
 
hi thank you both off you for your help yes I did use the New seal it was already stuck on the bottom off the filter cheers guys ill probably need your help again. cheers chris.
 
Peter Pick-Up said:
Best practice to fill the new filter with fresh fuel, before mounting, so you don't need to bleed the system, and you avoid the injectors to work dry for a moment..
Click to expand...

The JTD engine only needs you to switch the ignition on several times for a few seconds to prime the filter and supply pipes.

Always do mine 5 times for 5 seconds each time. Always starts immediately on the 6th time when turning the key fully to the start position.
.
 
Davren said:
The JTD engine only needs you to switch the ignition on several times for a few seconds to prime the filter and supply pipes.

Always do mine 5 times for 5 seconds each time. Always starts immediately on the 6th time when turning the key fully to the start position.
.
Click to expand...

The high pressure, mechanical fuelpump does the priming, but I can't see how, when the engine is not running.
By turning only the ignition switch, the pump doesn't work....:confused:
 
Peter Pick-Up said:
The high pressure, mechanical fuelpump does the priming, but I can't see how, when the engine is not running.
By turning only the ignition switch, the pump doesn't work....:confused:
Click to expand...

The high pressure side is not drained when you change the fuel filter, just the low pressure side around the filter. The pump acts as a one way valve. The electric low pressure "lift" pump is enough to re-fill this give a few cycles as Davren states. I used to prime cartridge fuel filters in the "old days" of mechanical indirect systems with no lift pump but it's not worth the time and mess with modern systems. I still prime oil filters though.


Robert G8RPI
 
OK, so the Doblo JTD has two fuel pumps.
My 2004 Alfa GT jtd doesn't have an electrical pump, just the highside one.
At least, I haven't found a second pump during 8 years of owning and maintaining this car, there is no "buzzing" from an electrical pump after turning the key as well...
So I keep on filling my new fuel filters on this car, and as the oilfilter is mounted sideways, no way to fill that one, I'm afraid...
 
The fuel filter, fuel return manifold and pipes are primed by the electric pump inside the fuel tank, which operates for a few seconds each time the key is turned to the MAR position. The common rail and it's pipe from the engine mounted high pressure pump, and the 4 short pipes from the common rail to the injectors don't drain out when replacing the fuel filter, so don't need priming.

I can't hear my electric fuel pump running unless I remove the rear seat or listen very close to the underside of the fuel tank.
.
 
I just had a look at my ePER, and guess what: there is an electric pump IN the tank as well for the Alfa GT jtd...
Never knew that, so you learn something new every day!
I'm still going to fill the fuelfilter like I did in the past, but will do the ignition key turning prime procedure as well, thanks for that!
 
Hi guys yes I did fill the New filter with fuel I didn't make much off a mess stuffed some rags under the filter when I took it off removed the battery to gain better Access as I had big Hands :D primed it few times and she fired up but did struggle first turn turned her over few times and job done cheers guys for your much needed help.(y)(y)(y)(y)
 
You must log in or register to reply here.

Similar threads

E
Technical Fuel Filter Removal.
Replies
5
Views
927
Erbl
E
D
Technical Fuel filter Fiat Doblo 1.4 petrol, 2006
Replies
1
Views
554
bugsymike
B
J
  • Question
General oil and filter change
Replies
2
Views
437
Twinturborob
T
S
Technical High pressure fuel issues
Replies
15
Views
522
bugsymike
B
H
General Fuel filter
Replies
2
Views
1K
hc1953
H
Back
Top