20 replies to this topic

[LS1LX]

Is anyone making a decent aftermarket pump for the 253/308's these days?

[Struggler]

Do a search, this was covered between 1 and 2 months ago.

[LS1LX]

Hey struggler, just did a search and come across the OzNos one you mentioned.

If thats my only option for mechanical then I guess its going to have to do. Looks trick

[MRLXSS]

Big T had a post about it....

You can get L34 Pumps, that flow at about 7psi peak

[LS1LX]

Big T had a post about it....

You can get L34 Pumps, that flow at about 7psi peak

Im upgrading from an L34 pump

Looks like its either L34 or the OzNoz pump

[MRLXSS]

Can you fit some form of regulator to the Holden Motor? Maybe a return line or something to keep continuous pressure?

[makka]

Can you fit some form of regulator to the Holden Motor? Maybe a return line or something to keep continuous pressure?

what are you on about? its not an electric pump, diaphram type mechanical pumps are self regulating

[MRLXSS]

Ok, I mean fuel pressure regulation... So it is a constant pressure and flow... Some form of pressure relief valve or something would help with this? I have just read up on it a bit lately. I don't want vapour lock to happen to me again, so i am trying to learn ways to stop it... Constant flowing petrol under good solid pressure is less prone to vapour lock, As is cools it self down while moving around... Petrol just sitting under pressure in your engine bay heating up is not what you want when you are at idle etc... So some form of return line to keep petrol flowing while its waiting to be burnt would be a bonus? Correct me if i am wrong, as this is how i have interrupted what i have read.

[MRLXSS]

kinda something like this





HOLLEY & BG 4150 FUEL RAILS WITH PRESSURE RELIEF


These Billet Fuel Rails eliminate the use of a conventional fuel pressure regulator. The idea is to supply your carby with maximum fuel flow and then to return to your fuel tank what you don't need, rather than using a conventional regulator than can restrict fuel flow in your time of need.
The brass poppet valve attached at the rear of the fuel rail is preset to 6.5 psi, so when the fuel pressure is higher than this the valve opens and returns fuel back to tank. If the fuel pressure is below this setting, every drop of fuel from your fuel pump goes straight into the carby.
( The poppet valve can be adjusted to your desired pressure setting. )

Under bonnet temperatures can be in excess of 70 deg C and a further benefit to this system is that you always maintain the freshest & coolest fuel at the carby rather than hot fuel that has been sitting under your bonnet for a period of time. This system eliminates " vapor lock & surge" from extreme under bonnet temperatures.

Are they useable with a Mechanical Pump? They look similar to what you put up though GMH355

Edited by MRLXSS, 10 July 2008 - 04:28 PM.

[makka]

you could use one but chances are with a mechanical pump like what your using Matt they would be way overkill and a waste of money

[TerrA LX]

http://www.pavtek.co.....ails mini.jpg

So MRLXSS from what u have described, if the fuel is under the preset limit would not you still have the same problem with this setup?

[LS1LX]

Im not putting any of that braided shit or fuel logs on an original SLR 5000, It has to be plain and simple.

I know how to setup a good fuel system for my chevs in either electric or mechanical but 308 mechanical pump options are all Im after.

I could fit an electric pump and be done with it, but I dont want to put an electric pump or a return line, its only 6psi required, I dont need a return line.

Just want a simple mechanical pump that will support a mild 308 with a 242 solid stick and L34 heads, nothing crazy.

I think all 2 of my option have been listed. Thanks all. OzNoz here I come.

[TerrA LX]

Standard holden V8 fuel pumps have one inlet and one outlet valve internally, L34 or Hi volume fuel pumps have two inlet and two outlet valves internally.

[REDA9X]

Holden are simply refering to the fact that all they sell is the sealed version of the L34 pump now. Originally yes there were 2 different pumps. MRLXSS, MERVEX covered what you are talking about, the filters had a small return line on some models to do what you were talking about. Somewhere I'd have a picture of one.

[TerrA LX]

MERVEX covered what you are talking about, the filters had a small return line on some models to do what you were talking about. Somewhere I'd have a picture of one.

HJ L31 Statesman was one i know of.
RYCO plastic replacement filter for this was the old valiant one (dont ask for part no) which has this third, smaller return line in built.

[rodomo]

Goss list a 7 psi pump, part no. G25308A found here:
http://www.noelsauto...s Catalogue.pdf

[REDA9X]

Here is the filter I was trying to find, it has a small return line. This filter screws into the front of the carby