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Discussion Starter #1
Hi guys, :wave:

After a long hiatus, I'm back to working on my '68 XR-7! Anyway, I'm contemplating putting aftermarket fuel injection on it. While thinking the process through, I realized I need an electric fuel pump but have no idea how to hook it up.

Suggestions/recommendations on where to draw power for an electric fuel pump?

Thanks!

Dave
 

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I think there should be a safety switch wired in with the oil pressure sending unit by using an adapter to reattach the oil sender. This way the electric fuel pump will stop working if there is no oil pressure. I had a toggle switch on my 67 XR-7 to turn on and off the electric fuel pump and the wires melted due to all the current it takes so a 30 amp relay and heavier gage wirig makes a lot of sense to install.

Steve

67 XR7 A code with A/C and cru ise
68 XR7 GT 390 with A/C and cruise
 

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The problem with the oil sender tied in would be that it has variable resistance and won't have consistent voltage. The key would really be your shut off switch since there is no wheel lock on a 68. Otherwise, yeah, I would put a toggle switch nearby to be an interrupt for the relay that feeds the pump. In a racing event. they may require a way to externally shut off the power in certain categories, or even a rollover switch - most guys just put a battery cut off switch near the back of the car to kill all power. On my car the battery is in the trunk with a cutoff switch, and I have the relays in the trunk that are just triggered by a key switched source. I fused the relays nearby with glass tube ones so I can actually see them. I don't like the mini fuses since they are difficult to see for sure. (some of them really suck)
 

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Dave, you might look at something like this. It's just one example of several out there. Pricey but might be worth it by simplifying a lot of the installation.

http://fitechefi.com/default.asp.pg-GoEFISystemFuelCommandCenter
I've been looking at that setup also. I've been searching the web for people who have had issues, and none appear to be a result of FITech. The closest I found was a poor running car that was a result of the intake not being torqued properly causing vacuum leaks.
 

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I know a local guy with a 1970 Z28 that has a 383 topped with an FI Tech unit. He has the front mount fuel cell with the electric pump to feed the injection and uses his mechanical pump to keep the fuel cell loaded. He has had zero problems with this setup. A good friend of mine with a '71 Z28 (I gotta get better friends) has a Hooley EFI/Kinsler setup on his twin supercharged 383. He is running an in the tank pump with a fuel tank built specifically for drop in pumps. I'm sure there are tons of options availible for mustangs that are bolt-in for the cougar.
 

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Go with an in-tank pump and don't look back. I went with this on my Cougar:

http://www.tanksinc.com/index.cfm/page/ptype=product/product_id=227/mode=prod/prd227.htm

If the 68 Cougar tank is the same as the 68 Mustang tank then I would get this and save you some time:

http://www.tanksinc.com/index.cfm/page/ptype=product/product_id=489/category_id=135/mode=prod/prd489.htm

Whatever EFI setup you get will trigger the fuel pump relay - so it'll automatically turn off the pump when you shut off the motor (so no need for an oil pressure safety, etc).

Here's a few pics of my install:

http://1973-mercury-cougar.blogspot.com/2016/03/march-4-2016-while-im-waiting-for-dyno.html

http://1973-mercury-cougar.blogspot.com/2016/03/march-18-2016-today-was-moderately.html
 

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Holley is introducing a new EFI system that is a very simple hook up and it will retail for $1000. It is called the Sniper. I am doing an install of the system for Legendary Cougar Magazine. The first shipments are to begin about June 15th.
 

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Discussion Starter #11
Whatever EFI setup you get will trigger the fuel pump relay - so it'll automatically turn off the pump when you shut off the motor (so no need for an oil pressure safety, etc).
I saw that. Makes it a little less problematic.

Thanks!
 

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The Holley claims to have a 4 wire hook up. I have my doubts...
I think your doubts are very well warranted ..... may 4 wires to just the throttle body but they still need to install and wire in the wide band O2 and other sensors to keep track of what is going on .


https://www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/sniper_4bbl_tbi_kits/parts/550-510


4 wire vehicle connection (Battery +, Battery - , Switched Ignition & RPM)
Integrated ignition timing control & coil driver
The included Wideband Oxygen Sensor provides realtime Fuel Map Learn!
 

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the terminator efi i installed was super simple. The sniper kit has been delayed and delayed time after time, not sure what the issue is, but that makes me nervous for it.
 

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That sniper kit looks suspiciously similar to the FiTech one doesn't it? Think Holley is just putting their own spin in it...? I Really like the flexibility of those to bring the fuel lines in on any corner. Not real sure about that tank with the HP pump built into it though? Seems like you would need a pretty hefty mechanical pump to keep the tank full on a high horsepower car. I think I'd just bite the bullet and plumb in an in tank pump. It will keep the noise down and keep the pump cooled for longevity.
 
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