Malcolm, way back when i used to have an EK Wagon with vk efi on it i simply ran the pump straight from the tank to the engine, this worked fine until the fuel level got down to approx 1/4 or a bit below it, on high speed corners or round abouts you'd get surge coming out of the corner, the only reason for the surge tank this time is to stop that from happening.
the small pump which feeds the surge tank is nothing more than a low pressure pump which you'd typically use on a carby motor, it has no regulator so its freely pumping as much as it can handle, this in turn means once it fills the surge tank any excess will just bleed back to the fuel tank.
the fact that the main pump is getting fuel from the surge tank then any excess from it goes back into the surge tank aswell, means that the small pump really doesn't have to move alot of fuel to keep the surge tank full.
the surging never used to be a big drama, especially considering the fuel gauge in the EK was never really 100% accurate meant that i had an early warning system for time to fill up
its not a huge extra cost ($150 for surge tank and $130 for pump) and for the life of the car i reckon it will be worth it.
now onto my small updates
really hasn't been alot of progress lately as i am helping my mate get his EH Wagon running and registered again (been in storage since 2003) but just saturday morning actually i got some new brake line (2 x 6mtr lengths) to make brand new lines for the entire car.
being that i have all sorts of custom brakes etc on the car i thought it was the best way, that and the fact i have little faith in 40+ yr old brake lines which have more pitting than you could imagine and half of which i never had anyways.
i decided apon using all commodore treads and parts as far as possible to make availability later on in life a bit easier.
so far only done the diff, but yeah, bent them up to suit what i think is the best route.
gotta add some metal tabs either side of the diff centre to hold them in place.
now i need to see if i can find a t-piece with a nice long flexable hose to connect to the original floor mount for the car, otherwise i'll have to get something custom made, but i think i want braided lines anyways so yeah, we'll see how that pans out.
im also going to get some more pipe in 5/16 to make all new fuel lines, but i'll finish the brakes first
its been quite fun making these myself, very slow and tedious to get the bends right and all that but very rewarding, and it also gives me a good chance to get some kays on the double flaring tool i got for christmas
its a strange feeling having all new lines in an old holden
anyways i've waffled on for long enough, time to make some food edible!
