Fuel Filter Hassles

Post by **BigMav** » Sat Jul 29, 2006 6:44 pm

Been having some real problems trying to bleed the fuel system after replacing the cav filter in the mav. I have cracked the bleed screw on the fuel pump and have been pumping the lift pump like mad but it just doesn't stop bubbling. I decided to tighten the screw on the pump and move onto the bleed screw on top of the fuel filter housing and couldn't get any fuel at all to come out at the top or into the sight glass at all. HELP!!!

Post by **not not** » Sat Jul 29, 2006 6:54 pm

Had same sort of problem with my cav type filter on my 4.2 GQ Also when driving and giving it a bit of curry it would suck a gulp of air. After replacing everything i could think of and rebuilding the pump i finally put the factory filter and prima head back on for curiosoty. Guess what? Problem sorted.
So i would say put original one back in if you have it still.
Cheers Jamie

Post by **BigMav** » Sat Jul 29, 2006 7:15 pm

Interesting. Mine has always had a cav filter and glass bowl since i've owned it but i think the filter head is original nissan, this may be the problem. Here is a pic.

Post by **BigMav** » Sat Jul 29, 2006 7:15 pm

Actually i'm positive its original nissan as it is stamped into it.

Post by **JWB** » Sat Jul 29, 2006 7:21 pm

I had the same issue once!
Take the filter back off and re-attach!
sometimes the seal does not seat properly and won't seal!

Post by **not not** » Sat Jul 29, 2006 7:23 pm

Diffrent type than i had. That is the adaption type that screws on to the original prima head. Mine was the whole replacement type with the new prima assembly. But like said the filter might not be sealed properly.

Post by **fnqcairns** » Sat Jul 29, 2006 9:46 pm

I have been told those original primers were prone to fail sometimes, so I changed the lot out for a full cav with primer. Could it be your primer is letting air in?

cheers fnq

Post by **BigMav** » Sat Jul 29, 2006 10:16 pm

JWB wrote:I had the same issue once!
Take the filter back off and re-attach!
sometimes the seal does not seat properly and won't seal!

Tried that, still no joy!

Post by **not not** » Sat Jul 29, 2006 10:22 pm

got a full cav type sittn in my shed at morayfield The one with the prima head. Your welcome to come get it tomorrow if you want as i am not a fan of them at all.
Cheers Jamie

Post by **BigMav** » Sat Jul 29, 2006 10:22 pm

fnqcairns wrote:I have been told those original primers were prone to fail sometimes, so I changed the lot out for a full cav with primer. Could it be your primer is letting air in?

cheers fnq

Whats involved with changing over for the full cav version? When pumping the primer it sounds like it is pushing air out when one of the bleed points is open but no fuel is coming through to the glass bowl under the filter. I'll try reseating everything again but I'm almost positive it is seated properly. Its starting to really piss me off!! Looks like I'll be driving the missus car again for work tomorrow.

Post by **not not** » Sat Jul 29, 2006 10:27 pm

It does sometimes take a while to prime the fuel through. As far as changing them all it is is the two bolts that hold it all in place and the 2 hoses Inlet and outlet. But you wont be able to run the water sensor thing but yourshouldnt have it connected anyway/

Post by **BigMav** » Sat Jul 29, 2006 10:32 pm

Yeah the water sensor is no longer connected to mine. Sounds simple enough, I have PM'd you by the way.

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Fuel Filter Hassles

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