GU Fuel Filter Priming

[mcleod]

Hi all,

Was hoping someone might be able to enlighten me on what I did wrong during a fuel filter change I did last night, specifically with priming the thing after the new filter is attached. I have a couple of manuals for my patrol, its a GU Y61 12/06 plated, 3L DI. I thought I followed both and could not for the life of me get fuel into the new filter.

Changing out the filter was easy, when it came to priming I tried the following,

1. Attaching both inlet and outlet hose and then up and down on the priming pump. After about half hour I was surprised to see not a drop of fuel had entered the new filter.

2. Remove the outlet line and then up and down on the priming pump. After another 20 minutes and a sore arm still no fuel into the new filter.

3. Slow and steady on the pump using my finger to block / unblock the outlet line. Process was depress the pump with outlet line unblocked then block the outlet with finger and allow the pump to raise again. Again after 20 minutes still no fuel.

Pretty pissed at this stage so I took the unit apart again, definately suction and pressure being generated by the priming pump. I could feel the suction on the inlet line when pumping so tried things again for another 20 minutes, still no fuel at all into the new filter.

In the end I hooked a seperate hose up to the outlet pipe and manually sucked the fuel up in to the new filter. Even from then I was having trouble. Even when fuel was coming out the outlet pipe with the temp hose attached, as soon as I attached the proper outlet pipe the priming would not work. I was just not getting the resistance on the priming pump that they mention.

Something which seemed so easy on paper was now turning into a nightmare. In the end I had to actually prime the outlet pipe to the injector pump by hand (using fuel proof pipet) till it was full and then connected that to the full fuel filter. Didnt even worry about priming from there as I new the outlet pipe was full and the fuel filter was full. Ticked the car over from there and took about 10s of starting and away she went. Has run fine since then aside from a little black smoke.

What a mission, anyone got any thoughts on what I did wrong?

Thanks in advance

[macca]

Did mine a while back and it took for ever, I know my arm was so damn sore.

I thought it was stuffed but remembered doing it before and it taking ages. PITA

[nickpeacock36]

I put a clamp on the tank pipe to prevent the fuel flowing back into the tank. A couple of pumps and she fired up fine.

Sent from my GT-S5830 using Tapatalk 2

[boots]

Next time with the outlet hose still off the housing , remove your tank cap and with a rag and regulated air pressure into the tank - not much , prime away and see how you go .

[NP99]

When I owned a diesel I used to fill the filter with fuel prior to screwing on, then primed.

[Alitis007]

On diesels at work if they don't prime with the pump i use compressed air to push the fuel thru and when its flowing i attach the hose ( should say its a 2 person job) then pump till its firm the crank it over, usually fires up straight away then hold the revs at 2k for 30 seconds and done deal. Should take bugger all time lol

[Rumcajs]

What this tells you is that either your priming pump isn't working correctly or you had a very low fuel level in the tank or you could have an issue with the fuel pickup side. (e.g. suction leak somewhere)

Priming pump failing is apparently very common occurrence. You can do a electric lift pump mod which will improve the system fuel supply (VP44 IP pumps have a dreadful failure rate if fuel supply fails below certain value)
or replace the filter housing with aftermarket unit with decent pump and better (read cheaper) aftermarket filters.
Otherwise you are going to have this issues every time. Cheapest/easiest/quickest is probably pre-filling the filter with fuel.

Normally it only takes about 10-15 pumps before fuel starts flowing out of the outlet fitting on mine I than reconnect the hose and finish priming the rest of the system with about 5 or so pumps (till full resistance is felt).

Cheers

[mcleod]

Thanks for the feedback all and sorry for late reply, been of their for couple days.sounds like the priming pump snookered. I could definitely feel suction and blow when activating the pump but guess just not enough.

[chrysler]

07 crd ours has a primer like a boat .took for ever sore forearms still no fuel i got pissed with it grabed my gauges and vac pump took about 10 secs to pull the fuel up .pretty luky i dont need my 22 gauges anymore..lol.
nextime i my buy 1 of those 10buck pumps you put on the drill .....

[Stokezi]

This is what we just had to do after fighting with it for hours
Next time with the outlet hose still off the housing , remove your tank cap and with a rag and regulated air pressure into the tank - not much , prime away and see how you go .