Hello and Welcome.
My name is ***** ***** Im happy to help / advise.
It sounds like you have air in the system - this can be caused by faulty pump and / or purge valve.
Really - this is going to be needed to be looked at by someone with the neceserry test equipment - otherwise, you could spend on parts etc / by mistake - and it cost you a lot of money.
I would never suggest to replace either as above without the proper tests done first.. and as most owners don't or cant be expected to own such plug in test equipment as it so expensive, I have to advise you get help for to do this... I hope you understand, Im trying to save you costly mistakes.
Now, the above all said - I do have a pdf manual for this vehicle - Im happy for you to have it.. it is full of very helpful info inc fault finding chapters etc -- To obtain , download this - click HERE. Its a large manual / file - so it does take time to transfer. I sincerely ***** ***** helps you.
Let me know how you go..and / or let me know if you need anything further on this..
~~~>>>>>>~ Meanwhile now - Please do click on the "Exc / Ok rating" for me at this time.. Thank you in advance for that . ..
Note that you can get back to me anytime at all after doing the rating - it doesn't close you out -
- Best Rgds, MIKE.