Thread: Fuel tank differences between GEMS and Thor

Here are a few pics of my Brown Davis long range tank before install. A couple of these are shown in Fuel Pump - a day wasted!







Original tank:

I measured the opening of the old tank, It's 115mm. It still had the seal in it, probably NTC5858. That seal, while of similar appearance, is smaller in diameter than the NTC5859.

I'll measure and photograph later after dinner.

well?
come on!

Both seals slide on but the old one is a bit tighter. Maybe it has shrunk. The RH one is the old seal.



This the opening of the plastic P38A GEMS tank, note the seals fits inside this and is clamped by the red ring. The hole is 114-115mm diameter.



This is the opening on the Brown Davis long range tank Scouse and I have. This is Scouse's tank. Note the flat surface on the very thin plate with the 111mm diameter hole in it. Around that hole is a threaded ring. A matching threaded clamping ring screws into this (see below). We believe this is a Thor tank.



This is the clamping ring as viewed from the underside. Note the chamfer. Now this, I believe, is the reason the GEMS pump won't seal in the Thor tank.

Having some old pumps to play with, I tried the clamping ring on the top surface of the GEMS fuel pump.



The flat edge of the ring barely touches around the periphery of the pump top. In fact, the pump top is also chamfered and this reduces the clamping surface area even more. The chamfers don't match and I can see daylight under the ring. I doubt it's putting even pressure on the mating surface seal I've in place.

The ring is tightened by a special tool which fits into three equidistant holes in the ring. You can see these holes in this pic:



What I intend trying with mine is removing the ring and drilling right through so that I can flip the ring over and still be able to tighten it. That will give a lot more surface area for clamping.

I might need to sketch what I mean to explain it.

Originally Posted by Scouse

The one on Gumtree has been sold according to the website which is why I thought you'd bought it.
Range Rover P38 Long Range Fuel Tank | Other Parts & Accessories | Gumtree Australia Knox Area - Boronia | 1067597287




A new one is only a couple of hundred dollars more than what he wanted for this one anyway.

Dunno what he had it advertised for on Gumtree but I just bought it off EBay. Now to get it to Sydney.....

Originally Posted by p38arover

Dunno what he had it advertised for on Gumtree but I just bought it off EBay. Now to get it to Sydney.....

Bargain at $600:

The fitting charge might make up the difference though .

Hmm, I wouldn't have paid $900.

Thanks Scott.

Originally Posted by mtb_gary

I noticed that Matar Motors in Melbourne also have a long range tank up for sale on eBay. Starting bid $950. It does not say what year the car was that it came out of.

It's back on again now, at a reasonable price now though ($650):
Range Rover P38 Long Range Fuel Tank Very Rare in VIC | eBay


Fancy another drive Ron?