I am looking at going the injection route and one of the items i need is a swirlpot. I found one on ebay but can anyone tell me what the two centre connections are for. I assume the bottom will by for fuel to injectors and the top one for the return.
Rescued attachment swirlpot.jpg

Bottom connects to the HP pump , next one up to the low pressure supply pump, one above to the fuel rail return and top one to the tank return to let out any air or vapour.
Paul.

Where does the low pressure pump fit in. all the drawings i have none of them mention low pressure pumps

see:

here

and

here

[Edited on 25/4/07 by ned]

thanks Ned

Im confused can anyone tell me or recommend a low pressure fuel pump and a high pressure fuel pump, what pressures do they operate at.

I am using a facet red top pump for the low pressure and a pump from a Sierra XR4 for the high pressure. low presure is only about 2psi and the high presure is regulated to approximately 45psi depending on what injectors and regulator you are using.
Paul.

quote:

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Originally posted by dave1888
Im confused can anyone tell me or recommend a low pressure fuel pump and a high pressure fuel pump, what pressures do they operate at.

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If you can get your HP fuel pump below the level of your tank you do not need a LP pump or swirl pot. You can do it like:

tank->filter-> HP Pump-> (HP filter) ->Fuel rail ->pressure regulator -> return to top of tank

If you have two pumps and a swirl pot then you need to make sure that the LP pump has pumped fuel into swirl pot before th HP pump starts.

[Edited on 29/4/07 by chriscook]

quote:

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Originally posted by chriscook
If you can get your HP fuel pump below the level of your tank you do not need a LP pump or swirl pot. You can do it like:

tank->filter-> HP Pump-> (HP filter) ->Fuel rail ->pressure regulator -> return to top of tank

If you have two pumps and a swirl pot then you need to make sure that the LP pump has pumped fuel into swirl pot before th HP pump starts.

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quote:

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Originally posted by chriscook
If you can get your HP fuel pump below the level of your tank you do not need a LP pump or swirl pot. You can do it like:

tank->filter-> HP Pump-> (HP filter) ->Fuel rail ->pressure regulator -> return to top of tank

If you have two pumps and a swirl pot then you need to make sure that the LP pump has pumped fuel into swirl pot before th HP pump starts.

[Edited on 29/4/07 by chriscook]

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True - my tank has a pot on the bottom and is baffled. (but I did already say the pump had to be below the tank.)

quote:

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Originally posted by rusty nuts

quote:

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Originally posted by chriscook
If you can get your HP fuel pump below the level of your tank you do not need a LP pump or swirl pot. You can do it like:

tank->filter-> HP Pump-> (HP filter) ->Fuel rail ->pressure regulator -> return to top of tank

If you have two pumps and a swirl pot then you need to make sure that the LP pump has pumped fuel into swirl pot before th HP pump starts.

[Edited on 29/4/07 by chriscook]

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Also the tank should be baffled to help with fuel surge. If the tank has no baffles a swirl pot is probably better

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So what is the purpose of the low pressure pump. Is it to keep the swirl pot full of fuel and then the high pressure pump pumps fuel from the swirl pot thru the injectors and returns excess to the swirl pot. Sorry if i seem a bit thick but its something i am just having a bit difficulty in processing.

Dave,

Yes, that's exactly right.

quote:

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Originally posted by dave1888
So what is the purpose of the low pressure pump. Is it to keep the swirl pot full of fuel and then the high pressure pump pumps fuel from the swirl pot thru the injectors and returns excess to the swirl pot. Sorry if i seem a bit thick but its something i am just having a bit difficulty in processing.

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