Working to get the fuel system together on the car. Would have liked to use the stock miata fuel pump and sensor assembly, but my fuel tank is too shallow to allow it as it is an in tank pump system. Thought about mounting the stock fuel pump outside, but there are a few pin holes on the pump itself that likely leak fuel. Would have to fabricate a canister to contain the pump in fuel so as avoid un-contained fuel leakage. Decided to order a new external pump and mount it inline with the fuel system. The stock pump is said to generally max out at 85 psi, but added flow may be desirable. I ordered a high pressure pump with greater flow rate, although this may not have been necessary, although it was difficult to find any external pump meeting the stock specifications. According to Airtex, the stock pump generally follows these specs:
|Outlet Size||5/16 in.|
|Outlet Type||Hose Connect|
|GPH (Free Flow)||45|
|Max Pump PSI (Not System)||80-100|
The pump will be installing has the following specs:
|Inlet Size||3/8 in.|
|Inlet Type||Hose Bead|
|Outlet Size||3/8 in.|
|Outlet Type||Hose Bead|
|GPH (Free Flow)||60-70|
|Max Pump PSI (Not System)||110-120|
So the new pump will have significantly higher flow capacity and somewhat higher pressure. I picked it up from amazon (http://www.amazon.ca/gp/product/B000DN7VME?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00) and it comes with mounting hardware, which is a bonus.
Also will be installing a Wix 33003 inline fuel filter which has 3/8″ fittings to match the new pump. (http://www.wixfilters.com/Lookup/PartDetails.aspx?Part=47940 available here http://www.amazon.ca/gp/product/B000CSEUPG?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00)
Will have to pick up some fuel line capable of fuel pressures reached in the system.
At this point I am unsure how the higher pump pressure will affect the fuel delivery, as the supercharger kit came with a fuel pressure regulator, which I believe will dial in the correct pressures and fuel delivery for the boosted system.
In my review the fuel delivery system I came across a few good resources regarding pressure regulators and system considerations.
Fuel Pump info (Turbo Miata): http://miataturbo.wikidot.com/fuel-pump
Fuel Regulator info (scientific paper): http://scialert.net/fulltext/?doi=jas.2005.781.786&org=11
Some info is provided in the supercharger installation manual:
There are a few different supercharger installation manuals kicking around online, which these photos are taken from.