Outer Limits 4x4 Board

HUSSLN wrote:The feed from holley, return from engine and return/breather from surge to tank are all plumbed into the top of the surge. The main line to the engine thru the h/p pump is in the middle at the bottom.

Would it be fair to say it is the same as this:



(with the pick up for the high pressure pump at the bottom and all the other fittings up top)?

If so then there is nothing wrong with the way it is hooked together, the problem is elsewhere.

I agree the shape of the surge tank is not typical but I would still guess that it's the supply to the surge tank that is letting you down, either the holley pump is bad or the line to it is blocked/clogged/stuffed/etc.

Hussy Pull the petrol line off the Holly and get someone to turn the key so its on see how much fuel comes out
Ps dont look at the end of the fuel line like i did
pps Sometimes a good idea to be smoking a cigarete when doing this Two reason 1) Stops you from getting cancer
2) If there alot of fuel well all know from the resulting explosion
ie if we all here it there was heaps if we dont the holly was the problem

Yeah when the heat goes down ill get out there and see if its blocked or not flowing enough, someone mentioned it should fill a 1.25 under 30 seconds the flow rate is good. ive also got a new filter to put in.

A long and low surge tank like that may be fine for general street driving but, once the vehicle is on a steep up hill, the HP "pickup" point is no longer at the bottom of the surge tank.

Depending on where the various return lines come in and out, the problem may be made worse - steep enough slope, you may find your surge tank effectively becomes much smaller, as the height difference between HP pickup and return to main tank decreases.

-Scott- wrote:A long and low surge tank like that may be fine for general street driving but, once the vehicle is on a steep up hill, the HP "pickup" point is no longer at the bottom of the surge tank.

Depending on where the various return lines come in and out, the problem may be made worse - steep enough slope, you may find your surge tank effectively becomes much smaller, as the height difference between HP pickup and return to main tank decreases.

I had considered that, if i put the main feed line at the back then its going up, but no good going down. So i guess something upright is more apporpriate that way on weird angles the fuel inside cant shift far from side to side. BUT! if the tank is being kept full which it should be by rights then why should angles matter

HUSSLN wrote:BUT! if the tank is being kept full which it should be by rights then why should angles matter

If the surge tank is being kept full then you don't need it.

I had this same problem with my 3rz conversion in bundera, I used the same surge system I have successfully used on many street cars. when used for off road though shaking of the main tank alows the Holley blue to suck air bubbles. Then the bocsh pumps it to the highest point (the fuel rail) and because the Holley Blue pumps more than enough fuel it creates a slight preasure in the surge tank and back up the return line which can be just enough to keep the air pocket there.

When my car was doing it I could take the return line off the fuel rail at the pressure reg and release the air lock and be on my way again.

There are a couple of different ways to fix it permently, it this is your problem.

Just thought of what it might be, hope it helps.