Tag Archives: fuel pump

Fuel System pt2

Received the new fuel pump, fuel filter in the mail and I picked up fuel injection line to use as my regular fuel line.  Fuel line is a Barricade with a rated working capacity of 225psi noted on the hose although the guy at NAPA auto said it was rated to 180 psi working pressure.

Layed up a section of fuel line to see how it will run and if I had enough. Looks like it will work well.  Will have to work out mounting the fuel pump somewhere onto the frame to avoid vibrations and noise.

fuel line
Fuel line running through the driveshaft tunnel.
fuel hose
3/8″ Fuel injection hose – Barricade Greenshield 225 PSI. Picked up 20′ of this. Sold for $3.90 a foot at local NAPA auto.
fuel pump and filter
Wix fuel filter (made in Russia) and Airtex E8248 fuel pump. Pump comes with mounting brackets and hose clamps.

Fuel System

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:



Type Turbine
Volts 12
Inlet Type Strainer
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:



Type Rollervane
Volts 12
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.