Is that plastic filler pipe suitable for fuel? I only ask because it is identical to water filler necks found on many motorhomes.

D.

How much are the filler necks going to cost, and are they definitely IVA compliant?

on an injection engine it works by having a regulator releaving the fuel pressure at the far end of the fuel rail back to the tank down the return line.
the pressure is usualy ajusted buy the regulator reacting the vacume in the manifold (some are fixed) and the flow is constent in the return when the engine is running with most of the volume of fuel been returned back to the tank
a sump or a swirl pot is needed to prevent the fuel pump running dry at any time
if you ar adding a sump to your tank it needs to be made so the fuel cannot slosh out back to the tank
think of it like a can shape part welded to the botom of a tank with a 10-12mm hole in the top to the main part of the tank with the feed and return lines at the bottom of the can shape
the fuel is then pumped to the engine from the sump and returned back to it so only the amount used by the engine need to enter the sump trough the hole in the bottom of the tank.
as you brake and go round corners the fuel stays in the sump
a swirl pot type is simmular but seprate to the tank fed by a smaller carb style eletric pump keeping it full of fuel and is used where ther is no room for a sump or as a retro fit to a normal carb car

system goes

tank-sump or pot-high pressure fuel pump-filter-fuel rail-regulator-tank return

I have built tanks for off roaders in the past that had problems with the fuel getting away from the pick up <sumped or not> , going up really steep hills for to long or racing round in circles had the fuel leaving the end of the pickup pipe for long enough to cause the fuel pump to cavitate.What we did was to have a rubber tube pickup dropping into the tank with a small weight on the end and where ever the g force took the fuel the pickup pipe followed. Early aircraft had
something like it to fly upside down .

Just thoughts

Bob

yep.... they call them clunk tanks.....still in use for model aircraft.

Found this one on Ginetta G20 tank,hole in the bottom plate of tank and sump welded over the hole with feed and return in it,crude but effective.

sounds like the same thing im on about in diffrent words :D

Please pencil me in for an MX5 SSC GRP standard tank. What's the differnece between a long range and a standard?

any idea of price and timing ?
 

Hello Phil Talon,

I'm looking forward to receiving the bespoke tank. I may have missed something in the thread but has a price been mentioned ? or a time of delivery ?

Eddy