VK fuel pump

[squiblex]

i have a vk carby 308 an the in tank pump an sendr has carked it can i use a 202 fuel tank sender an run an external pump?? an does it have to have a mecanical pump coz mine doesnt an im not sure it has ever had one on it , should i put one back on it withe the electric pump??

[bogan_vk]

i may be wrong but dosent carby v8s have the fuel pump mounted on the block ,i know my 253 was a mechanical engine block mounted pump.

[Jonno]

lol on the carbd v8s their on the block
facing the car bottom left..
oh ur saying the mechanicle pump was blocked off and their running a in tank electric pump?
in that case are u sure the pump and the sender has carked it?
it miight just be the sener

[squiblex]

yea the one on the block has been blocked off, an i kno the senders fckd cause the float fell off in the tank wen i pulled it out lol pump might be fine but the sender wire has been fixed before coz the wire was soldered back together an that was snapped aswell i think i just need the sender unit but do i need the one on the block aswell or is one in tank pump good enough???

[bogan_vk]

you can just use an external low pressure electric pump mounted near the tank just make sure you get one rated to suit your 308.

[Jonno]

yeah probly just the sender bro, mines farked too.
nah keeping it blocked off should be fine
get a new sender first and fit it. and see if ti fixs it

[squiblex]

you can just use an external low pressure electric pump mounted near the tank just make sure you get one rated to suit your 308.

but can i use the standard 202 sender unit with the external pump or is v8 an 6 senders different??

[ari666]

VK V8's have an electric low pressure pump in the tank and CAN have a mechanical on the block, but often dont. my intank crapped out too. dont worry about changing the sender if its too much of a ballache. i just hooked a carter black to the the fuel tank strap and left the sender alone. it worked fine. no lean condition at high rpm and it went on the dyno with the old pump still attached/not working.

i recently dropped my tank to repair a hole so decided to rip the guts out of the old pump and hook it back up empty. i dont think it will make any difference because carbys only need between 6.5 and 8 psi of pressure anyway. but if you can be bothered dropping the tank, then maybe thats the best idea too. make sure you hook all the body back up though. mostly for the strainer at the base of the pickup.

also: make sure you put a filter BEFORE the new fuel pump, cos' they are known for picking up all the crap in the bottom of the tank and dying. fit a filter and pump. run a couple of tanks from very full to very empty, then replace the filter.

[Jonno]

Like ari said get a carter pump and hook it up like those

[ari666]

^^^ where is that located? looks a little high to me. cos' they are gravity fed they need to be mounted lower than the lowest point of your tank, or else when fuel gets level with the pump, itll stop flowing.

edit* also you will need a reuglator to run a black. they are set at 15psi which is waaaay too high for a quaddy.

[squiblex]

i need to drop the tank anyway to get the other half of the sendr out an clean the tank cause its been sittin around for the last 3 years an the fuel looks a little bit blacker than usual, how hard ar the external pumps to hook up do i need to run new wires or can i just use the same wires that are there for the in tank pump?? are the senders the same for the 6 an 8 cause i cant find one for a v8 un less there the same noones got one, the main thing i need is the sender unit mine broke in a few bits, the in tank pump is prob fine though just need a new mount sender thing for it..

[ari666]

im pretty sure the senders themselves are the same, but the (vk) V8's all have the intank pump attachment. i havnt really looked into the differences TBH

this is a crudded up 6 cylinder that went straight in the bin:


the only thing you will need to check is the resistance on the sender itself. if the resistance is the same, then the sender is the same. i can imagine that holden changed senders for 8's cos' they dont have much imagination.

hooking up the pump isnt all that hard, but i had a few issues with priming(filling up the fuel bowls after it has been sitting for a while), so instead of using the tachometric relay, i just bypassed and have it set on ignition 'on'. it means if i ever have an accident i am pretty much guaranteed to die in a ball of fire.

[Jonno]

Like ari said get a carter pump and hook it up like those

its on the tonner.
right next to the tank where the tray screws onto..

the persion doing out brake and fuel lines said its the perfict spot

[ari666]

ah soz. thought it was in yer VK.

[squiblex]

hey cheers for the help, i bought a vk 6 sender an float thing it fits but the fuel gauge doesnt work lol ill figure that out later, i found out that intank pump is just a primer pump an thats why its so small an i should of had a mechanical pump on it lol so i just went out an bought the other senderr unit an an aftermarket external pump cost me $109 its not a holly but some pump from new zealand it has 3 to 4 psi an doesent require me to put the mecanical pump back on, worked killa as car started within seconds lol i dont kno how v8s are ment to run spesh an old one but it goes ape #### lol revs up quicker than my v6, so im wonderin weater that what the guy said bout the stage three heads an cam is true haha

[ari666]

wow. ok let me give you a piece of advice... DONT REV IT. lol. you lean that mofo out on 3psi and youll cook your heads.

[squiblex]

lol whys that is 3 psi not enough?? it doesnt starve for fuel though, an it idles fine..

[ari666]

itll idle fine and drive fine, but the pump wont fill up your fuel bowl quick enough when you are giving it some stick. whatll happen is the fuel bowl will run out of fuel, lean out the mix and cook your exhaust valves. (worst case scenerio) prolly be fine for day to day driving.

[squiblex]

wat should i do then ?? get another pump with a higher psi??
wat psi should it be runnin at?? could i just but anouther one the same an run two of them??

[ari666]

you need between 6.5 and 8 psi for a quadrajet to run properlley. i cant say if two pumps would do it. i doubt it. the cheapest option from here would be to stick a mechanical one on as your primary and use the elce as a supplimentary.

[squiblex]

lol cheers i might just buy a bigger pump, any recomendations that arnt more than a couple hundred, if i got a mecanical one id but it brand new anyway so might as well spend it on a bigger pump... how quick would it burn the valves out cause my feet are kinda heavy lol, an i dont have funds for bout anouther week. an its got no rego so i cant drive it any wayz... so would that be the reason that it died in revs wen iwas doin a skid or is that a small tuning fix???

[ari666]

i was talking worst case scenario. it'd probably never happen like that. but still that 0.01% risk isnt worth it to me. but at least you have been warned

all decent electric pumps will cost you towards 200 bucks. the carter black was 115 but once you added 50 for the regulator and a couple of bucks for all the fittings and filters it added up to about 200. the holley blue (or red, cant remember which one self regulates) is just on 200 and the other one is about the same as the carter, but again you need to get a regulator and fittings.

mechanical pumps are 90 bucks and itll last you 10 years. itll pump exactly the right pressure for you quaddy so you never need to worry about it.

[squiblex]

sounds easyer to put the mecanical one on lol cheers for the help