EFI with stock FUEL sending unit questions - Ford Mustang Forum
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post #1 of 4 (permalink) Old 10-12-2013 Thread Starter
pinkblob66's Avatar
Joined: Jul 2010
Location: Orlando
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EFI with stock FUEL sending unit questions

Okay. I have a 1966 mustang coupe. Right now I'm in the process of building up an engine for the beast. I have a 1991 Mustang motor with edelbrock RPM performer heads, probe forged pistons STD, x303 cam, Magnum procomp pushrods, 1.6 roller rockers, PC-3247 procomp throttle body and a Procomp Manifold PC24030.. among other little things.. I want to get this thing in the car and running ASAP... but I'm having a problem understanding how to get the fuel to the injectors.. SO, how/what do I need to install to get the fuel there. The little 289 had a manual fuel pump, so this is new territory for me considering I know I will need an electric pump.

I know I will probably need something like this kit, but I'm not sure if it's application will work for fuel injection.


Keep in mind I have a stock sending unit (new) for the original 66 set up. Any help regarding this topic would greatly be appreciated. If you have done something like this please tell me what/how you did it.
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post #2 of 4 (permalink) Old 10-12-2013
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Location: Long way from home
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How are you wiring this car up? That will dictate what you need to fabricate in the way of fuel pumps.

1988 Mustang LX coupe will miss you greatly
traded for:
2004 Mazda 6s 5 door Sport w/5spd/3.0/RX8wheels/Kon/Eibach/and then some

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post #3 of 4 (permalink) Old 10-12-2013
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Joined: Feb 2009
Location: Lafayette
Posts: 751
sounds like a very nice start on the build, just need a little more info here...
you are planning to going EFI right?
if thats the case you will ALOT more than just a fuel sending unit, Your old carburetor’s fuel system was a returnless system that ran at only about 5-6psi, the EFI system utilizes a return line and operates at a much higher psi. The fuel hose from your carb’s fuel system isn’t rated for the fuel pressure associated with the EFI fuel system, so it must be replaced.
here is great site i used in my swap (here) has everything you need and can take you step by step, be safe

67 Coupe
91 302 roller .030 / Comp Cams #XE266HR cam
Edelbrock RPM Heads / RPM Air Gap intake
Holley Street Avenger 670 carb
Crane Gold 1.6 rockers
"blood-sweat & beers" :smoke:

68 Coupe w/ 93 roller and T5 EFI
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post #4 of 4 (permalink) Old 10-12-2013
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what you need is one of these sending units from mustangs plus that has a return line provision if you want to run a stock style setup.

Mustangs Plus :: EFI & T-5 Conversions :: EFI Fuel Pumps & Sending Units :: 1965-68 RMP EFI Fuel Sending Unit

or this kit has basically everything to run your fuel lines.
Mustangs Plus :: EFI & T-5 Conversions :: EFI Fuel Pumps & Sending Units :: 1965-68 RMP EFI Fuel System Kit

65 mustang. supercharged 302 currie 9 inch, 5 speed.

67 mustang built for my daughter

89 convertible lx in progress

click on the house icon to see my garage page with build info.
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