P38A Refuelling issue.

Hi all,
Sorry to ask but I cannot find a definitive answer in RAVE or my workshop manual in searches here or on the interweb.

Since the fuel hose between the filler-neck and the tank was replaced some little while ago I have had difficulty in passing water fuel into the tank on fill-ups. The pumps (various filling stations) all keep shutting off as if there is a back-flow and the pump thinks my tank is full it isn't; (and this behaviour happens at all levels of the tank and whenever I try to put fuel in).
Refuelling wasn't like this before the hose was replaced, and I cannot find any references to a "vent-hose" that ensures no "blowback" when refuelling. I am stumped.

The replaced hose just went from the bottom of the filler neck assembly to the tank spigot, and there was nothing obvious in that area.

All help gratefully received.

There is an anti siphon valve that may have been refitted incorrectly if memory serves me correct.

Datatek said:

There is an anti siphon valve that may have been refitted incorrectly if memory serves me correct.

Click to expand...

Ohhh...good to know. I will check into that.

I think ratherthan venting the vapour is trapped in something containing activated charcoal and then sucked into the intake and burnt when running. I cannot recall what the thing is called though.

Grrrrrr said:

I think ratherthan venting the vapour is trapped in something containing activated charcoal and then sucked into the intake and burnt when running. I cannot recall what the thing is called though.

Click to expand...

Its CALLED a V8.......

Grrrrrr said:

I think ratherthan venting the vapour is trapped in something containing activated charcoal and then sucked into the intake and burnt when running. I cannot recall what the thing is called though.

Click to expand...

No vapour trap on the diesel

There is a flap thing in the moulded filler tube, it's right at the end where the short rubber hose fits.

Flossie said:

There is a flap thing in the moulded filler tube, it's right at the end where the short rubber hose fits.

Click to expand...

That's the anti siphon valve

Datatek said:

That's the anti siphon valve

Click to expand...

I know, but I can't spell sigh fun.

Flossie said:

I know, but I can't spell sign fun.

Click to expand...

It's there to stop Plod putting a pipe down to check if you are running on red diesel

Datatek said:

No vapour trap on the diesel

Click to expand...

I thought he had a v8?

Datatek said:

No vapour trap on the diesel

Click to expand...

Because it's diseased

kermit_rr said:

Because it's diseased

Click to expand...

It isn't as volatile as the v8. See what I did there? I'll get my coat ...

According to my RAVE there's a separate breather hose on diesel & petrol versions. EVAPS version has other pipes as well.

Diesel & petrol sections both contain the same "Service Repair No - 19.55.07"

pwood999 said:

According to my RAVE there's a separate breather hose on diesel & petrol versions. EVAPS version has other pipes as well.

Diesel & petrol sections both contain the same "Service Repair No - 19.55.07"

View attachment 272263

Click to expand...

Thanks, I will take a look.

Has it developed over time?
There are enough vents to stop the fuel rushing up the pipe and doing the cut off of the petrol pump.

I have been looking and I know you replaced the bottom pipe.

It has to be a venting issue. You may have to find them and blow them through but some seem to have roll over valves in so maybe gentle with the air

Anyway there seems to be an "anti trickle" valve (to stop you getting that extra galleon) I wonder.

Or you could always stop showing off chucking 200quids worth and just stand there pretending and just trickle in a tenner.

J

pwood999 said:

According to my RAVE there's a separate breather hose on diesel & petrol versions. EVAPS version has other pipes as well.

Diesel & petrol sections both contain the same "Service Repair No - 19.55.07"

View attachment 272263

Click to expand...

EVAPS. That's the thing I couldn't remember the name of.

Grrrrrr said:

EVAPS. That's the thing I couldn't remember the name of.

Click to expand...

Carnation Milk? ;-)