Discussion
I'm starting to plan my fuel system in more detail. I had planned to use a pair of cossie fuel pumps as they are familiar to me and reliable, however I am considering using in tank pumps and have noticed uprated Jap ones on Ebay that go to 500bhp and I quite like the idea of quieter in tank pumps.
I'm scratch building the car so the tanks etc are all to be fabricated so I'm really wondering what the real word ideal fuel system would be..... i.e. low pressure in tank pumps feeding a swirl pot in the engine bay and then high pressure pumps etc? or will a simple pair of high pressure in tank pumps be just as good?
I'm scratch building the car so the tanks etc are all to be fabricated so I'm really wondering what the real word ideal fuel system would be..... i.e. low pressure in tank pumps feeding a swirl pot in the engine bay and then high pressure pumps etc? or will a simple pair of high pressure in tank pumps be just as good?
I'd avoid using 2 pumps if possible, especially if you dont actually need them.
I'd also avoid having a swirl tank in a hot engine compartment.
What sort of usage will the car see ? Is a swirl tank even necessary ? Will you be doing a lot of track use ?
500bhp in what mode ? n/a, blown ?
The little Walbro pumps will handle 500bhp, and represent superb value for money, and are proven very reliable.
The GS340-342 range have outlets in slightly different orientations compared to inlet. Little odds really..
The GS392 is an in-line version of the in-tank pump, although I think its outputs arent quite so good.
A single in-line cossie pump is also decent, but wont support 500. Its pretty much the same pump as found on any sierra or granada with an in-line pump.
You could go for a single Bosch 044, which will be better than the Walbro, but can be a bit of hassle due to its threaded fittings in and out. More suitable if you want to use -AN /JIC threaded style fittings and braided hoses etc
Abilities on the 044 vary around the world. Some suggest 500+, others 700 from a single pump.
Its an in-line normally, but can be used in tank too.
I'd also avoid having a swirl tank in a hot engine compartment.
What sort of usage will the car see ? Is a swirl tank even necessary ? Will you be doing a lot of track use ?
500bhp in what mode ? n/a, blown ?
The little Walbro pumps will handle 500bhp, and represent superb value for money, and are proven very reliable.
The GS340-342 range have outlets in slightly different orientations compared to inlet. Little odds really..
The GS392 is an in-line version of the in-tank pump, although I think its outputs arent quite so good.
A single in-line cossie pump is also decent, but wont support 500. Its pretty much the same pump as found on any sierra or granada with an in-line pump.
You could go for a single Bosch 044, which will be better than the Walbro, but can be a bit of hassle due to its threaded fittings in and out. More suitable if you want to use -AN /JIC threaded style fittings and braided hoses etc
Abilities on the 044 vary around the world. Some suggest 500+, others 700 from a single pump.
Its an in-line normally, but can be used in tank too.
I'd use an in-tank pump in a swirl pot with the fuel return into the tank angled to feed back into the swirl pot.
Having burnt out two external high pressure fuel pumps in the Cobra I put the swirl pot and pump combination from a BMW into the tank and its never missed a beat.
The result is a very quiet fuel pump system that is reliable and never lets the engine run lean under acceleration or cornering.
Cheers,
Tony
Having burnt out two external high pressure fuel pumps in the Cobra I put the swirl pot and pump combination from a BMW into the tank and its never missed a beat.
The result is a very quiet fuel pump system that is reliable and never lets the engine run lean under acceleration or cornering.
Cheers,
Tony
Why did your pumps fail ??
Continually running a low fuel level so starvation could occur would cause that ( exaggerated when cornering )
A Swirl tank is a good setup, mostly for use in extreme driving conditions. But as he is getting a custom made tank, no reason why an internal collector/baffling cant be installed, so a seperate external swirl tank is not needed.
Even with a swirl tank setup, if you continually run a low fuel level in the main tank, or internals in the tank are of bad design around the fuel pickup, eventually you will destory the lift pump too.
Continually running a low fuel level so starvation could occur would cause that ( exaggerated when cornering )
A Swirl tank is a good setup, mostly for use in extreme driving conditions. But as he is getting a custom made tank, no reason why an internal collector/baffling cant be installed, so a seperate external swirl tank is not needed.
Even with a swirl tank setup, if you continually run a low fuel level in the main tank, or internals in the tank are of bad design around the fuel pickup, eventually you will destory the lift pump too.
Cheers for the response.
I'm going to be running twin turbos on a BMW V12 and power will exceed 500bhp. In the original car each bank is run separatelly with its own ecu, pump fuel rail etc.
This is why I was planning on keeping the separate fuel rails and running two cossie pumps which would be good for 750bhp.
I will be baffling the fuel tank carefully so in therory (if done correctly) there will be no need for a separate swirl pot.
The car will see track action and should handle very well so surge will be an issue I need to address.
>> Edited by andygtt on Monday 13th February 09:47
I'm going to be running twin turbos on a BMW V12 and power will exceed 500bhp. In the original car each bank is run separatelly with its own ecu, pump fuel rail etc.
This is why I was planning on keeping the separate fuel rails and running two cossie pumps which would be good for 750bhp.
I will be baffling the fuel tank carefully so in therory (if done correctly) there will be no need for a separate swirl pot.
The car will see track action and should handle very well so surge will be an issue I need to address.
>> Edited by andygtt on Monday 13th February 09:47
I have a Walbro in-tank pump bought as part of a Nissan 200SX owners club group buy which was of the order of 200 pumps ie a decent sample size. I believe that they have proved very reliable and are good for a good few hundred bhp.
I'd be inclined to build the tank with a sump and use only an in-tank pump. you've probably thought of this!
I'd be inclined to build the tank with a sump and use only an in-tank pump. you've probably thought of this!
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