Fuel pump wiring question

[HardRocker]

I’m converting #172 to aluminum tanks with a single in-tank fuel pump and single level sender and replacing the C5 tanks that used the dual pumps and dual level senders.

Which part of the harness should I use to power the one fuel pump and for the one fuel level sender?

Thanks!

[Perkster029]

With my crate engine, the computer has a fuel pump wire output that I use for the +12V (I'm not sure how a vette donor engine would control it, if you have that). I used the pink Instrument Panel wiring for the gauge routed to the sender.

But, the GTM doesn't usually utilize the second jet pump in the driver-side tank. And with the crossover tube the way it is, gas levels should be equivalent in both tanks, so only one sender is being used. So, you could probably wire things pretty much GTM-normal. Not sure what shape yours is in, though, since I saw you got it second-hand.

[HardRocker]

But, the GTM doesn't usually utilize the second jet pump in the driver-side tank. And with the crossover tube the way it is, gas levels should be equivalent in both tanks, so only one sender is being used. So, you could probably wire things pretty much GTM-normal. Not sure what shape yours is in, though, since I saw you got it second-hand.

Thanks. This one #172 was running and drivable and had both pumps plugged into the harness. I’m thinking the connector that was on the passenger side tank is the one I need to check on using.

[Perkster029]

Yep! The passenger side tank should be the one with the pump that delivers to the engine.

[HardRocker]

Thanks Ryan. You’re in Plano not far from here. I just pm’d you.

[VRaptor SpeedWorks, LLC]

Yes, the GTM Passenger tank is the pump tank. If the original owner wired it per the FFR manual, they probably have it wired to use both fuel level sensors in series.....which means you'll probably have to do some re-wiring and also install a new fuel gauge if yours has the older, original non-programmable fuel gauge. The original fuel gauge shipped with the kits never really worked right anyway, as I believe it was calibrated for a Mustang and when the GTM tanks were completely empty, the gauge would still show over 1/8 tank of fuel.

[HardRocker]

Thanks again Shane. Luckily I’ve got the old Nordskogg gauges.