CFI-EFI  Electric  FUEL  PUMPS

 

When the LX started missing above 4500 RPM, I deducted that the internal fuel pump had failed.

    I checked this out by listening for it, couldn't hear anything, but not sure if it can be heard even when running.    Then I disconnected the External Rail pump & monitored the pressure (none) while I turned the Key ON several times.   When you turn the key to ON position without the engine running, the fuel pumps shut down after several seconds for Safety!

    At least the car can be driven some without the Low Pressure Internal pump!   Now I'm wondering if when the High Pressure pump fails (Low Pressure good) will it run at least enough to get it off the road & parked?   Will test this out after repairs are done.     May be good reason for a 2 pump system!
    So this is a good time to see if an up-grade is possible!    First checked with Ford to see what was available.  Nada!   Part of the problem is that the LX came standard with an Extended Range tank, which is deeper, 20 gal verse 16 & being Ford only sells assemblies (E4DZ-9H307-A), had a low demand & is now obsolete!   So it's off to the Aftermarket for a replacement pump, not assembly!

     The LX used the same pump combo as did the V6, while the Mustang had more output!    The External pumps are the same & none from Ford are any better, but the Internal Mustang one is better!    But it's a different configuration, so will take some tweaking to fit!       Info for a winning bet --- Ford has used about 150 different Electric Pumps since 1980!!!

     The problem with getting much more power out of the CFI system, is the limited fuel flow from the 2 injectors without going to higher pressures.  The LX/Police injectors are the biggest available from Ford, 52 #'s/hr x 2 = 104 #'s/hr total.  While the Mustang's 225 HP EFI engine has 8 x 19 #'s/hr = 152 #'s/hr total.
   
Used in Airtex PN Int-Ext GPH wide open PSI shut off In Tank Strainer notes
83-86 LTD V6      84-85 LX 5.0 E2035 Int 20-35 4-6 FS102 FS22 CFI,  V6 & 5.0 HO
83-85 M Turbo     84-85 M 5.0 CFI* E2025 Int 50 6-8 FS10 HO
83-86 Fords CFI* E2000 Ext 30-40 70-95    --- V6 & 5.0 HO & non HO,  needs Int.
85-87 Charger E7052 Ext 45-50 110-120    --- needs Int,  30-40 GPH,  5-7 PSI
77-91 BMW E7334 Ext 50 100-110    --- needs Int,  45-60 GPH,  2.5-5.5 PSI
Universal ** E8248 Ext 60-70 110-120    --- needs Int?
88-92 Peugeot E8260 Ext 50--60 100-110    --- doesn't show Int.
85 + T-Bird, Lincoln,  CFI-EFI E2044 Int 45 90-100 FS185 non HO
85  M  5.0 CFI  *  86+ M V6 & 5.0 EFI E2061 Int 40-50 80-90 FS111 HO & non HO

* The 85 Mustang 5.0 HO AOD CFI changed from the Int-Ext combo to only a Int (E2061) after 11-84,  this allowed room for a dual exhausts, still using a "Y" pipe.

** There are other brands that have more output, see below!

One up-grade is to add a bigger gauge power wire, that's covered below!     The following links were found by Binnie & offer a number of up-grades!

http://www.autoperformanceengineering.com     Walbro Fuel Pumps

http://www.racetronix.com/Racetronix-Mustang_Pump_Kit.html

http://www.alternativeauto.com/waterbox/wb-archives/boostapump.html

http://www.roadraceengineering.com/fuelpumptechtip.htm

http://www.gnttype.org/techarea/electrical/relay.html

http://www.merkurencyclopedia,com/fuel/fuel_pump_upgrade.html

http://www.shrapnel.gankish.net/87towncar/fpump.html

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