there is two malpassi regs...

one is for efi type pressures

one is for carby type pressures

a vl pump is around 75-100psi

a carter is up to 16psi

you need a carter with the right rising reg... or instead of a reg there is a cheaper way which i used but it takes a bit of explaining

any pressure over around 5psi fuel pressure will overcome the needle and seat (flooding the carb)... until you put boost down the carb.... then you need to increase fuel pressure as boost increase otherwise the boost starts pushing the fuel back out the carby



back to what i was getting at before.... after about 7psi the 32/36 will start spitting out gasket quite regularily... spilling fuel all through your engine bay and on your exhaust

so if your serious about blow through carb save yourself more "reaserch and development" and box that carb from the start.... or keep it to really low boost

it's not really reaserch and development... many have done it before

i can help with a fair bit of advice i feel cause i have gone through a lot of it before. if i miss your questions PM me


i have a few carby turbo photos in my gallery if you would like to look

as many people know research and development is fukn costly stuff. hope the carter works for you

well here's an update. got a new pump (same as the one before) and put it in. ute ran well for about 10mins then started to play up again, like it is running out of fuel and is getting worse and worse.

i will now take the vl pump back and get a store credit and buy a "carter black" pump to go on the ute. i will also take the tank out and clean it out thoroughly and put some new petrol in.

i guess i admit to being ignorant, but i honestly thought that with a return line in place and the regulator set correctly for the carby that i wouldn't have any troubles with the pump. but i guess you live and learn.

i not 100% sure as i dont know everything about everthing, but it may not be as im pretty sure ronald is using the malpassi rate reg he got of me. the reg he is using is a carby reg not a efi reg. i would say the carby regs are only good for carby pumps as it may be working in the same way as as the fuel pumps.

I know what your saying about the EFI pump, but i thought the Rising rate Malpassi regulator has a return line built in for the extra fuel to feed back to the tank.

If so would that be enough to releve the pressure or still to powerful?

ill try to explain it in another way. in relation to the difference of an efi pump to a carby pump. would be like using a garden hose (carby) and a straw(efi). the garden hose will obveously be able to fill say a bucket way faster than filling with a straw but the straw would punch out a much higher pressure.... this may have just confused the fuk out of you but its just another way of thinking about it, im sure it would be much smarter to just start with the carter. could you get store credit instead of the replacement or just switch it for the correct pump. and if all that didnt confuse you its like revhead said a reg is just like a clamp. the tighter the clamp the less flow

To give you an idea about an efi pump, they can produce up to 650kpa of pressure. The internal fuel pressure relief is usually set to around 600kpa (87psi). If you have the base setting on 4psi (27.57kpa) you are effectively forcing the VL pump to bleed off internally at a rate that will overheat the pump to the point of failure. It would be like driving a VL with a set of locking pliers on the return fuel line.

the idea of a fuel pressure regulator is to regulate pressure, no?

well if i use a pump (the one i got the other day is faulty, i tested the pressure at the pump output and got nothing) to supply fuel at any pressure, will the regulator not supply enough fuel to the carby at the designated pressure (say 4psi, so long as it's not higher than what the pump is capable of supplying) and return the rest to the tank via the return line.

i believe that the problem is not within the carby itself but the fuel supply. i am glad to have found that the hole i was worried about is just an overflow. i am also glad to have tested the fuel pump and found it was buggered (and still under warranty). i will fit a new pump tomorrow and see if the problem persists. if so then i will try a new pump.

one thing i haven't mentioned in this thread is that i did drive the ute around the block once without any hassles, but now i only get to the first corner. i am hopeful that with a new pump, filter and fresh tank of fuel i will be trouble free.

what frankthedolphintrainer said beat me to it

welcome to the world of expenisve unreliable noisy fuel pumps

you cant use the efi pump

you need a carter or a holley blue/black etc with a regulator

the 32/36 is terible for spitting its gaskets out under boost too

been there.... didnt last long before i went efi

are you boxing the entire carby? i would say that is the only way to go if you can figure out a good way for the accelerator cable to still work in a box you will do well