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Old 04-20-2012, 06:34 PM   #1 (permalink)
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v8 swap fuel question

I just set my chevy 350 th350 np231 with sye into my 89 yj today and i was thinking about fuel delivery. can i just take the fuse for the fuel pump out of the jeep and hook the fuel lines up to the mechanical pump on the motor? i was also told by a friend that the fuel pump in the tank in my jeep already has the right fuel pressure to run a carbed 350. is that true then i could just go straight to the carb right?
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Old 04-20-2012, 09:17 PM   #2 (permalink)
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Not too sure on the chevy motors. I'm sure novak conversions might have some info on it?
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Old 04-20-2012, 09:19 PM   #3 (permalink)
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I just set my chevy 350 th350 np231 with sye into my 89 yj today and i was thinking about fuel delivery. can i just take the fuse for the fuel pump out of the jeep and hook the fuel lines up to the mechanical pump on the motor? i was also told by a friend that the fuel pump in the tank in my jeep already has the right fuel pressure to run a carbed 350. is that true then i could just go straight to the carb right?
No.

You don't want to try and use a mechanical pump, to pull fuel thru the electric in-tank pump that's already there. Too much restriction.

Instead, pull the tank, remove the sender & pump, then replace the pump only with a piece of hose. Reinstall. Then use the GM mechanical pump.

This is how I did my YJ.
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On my TJ, I ran GM TBI fuel injection, but used the TJ's electric in tank pump. Had to add a return fuel line. Everything else was straight forward.

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I don't remember if the GM carb'd engine has a return line. If it doesn't, the YJ electric pump will produce too much pressure, and you'll have issues. Yeah, you can put a regulator on it. But it's just easier to run the GM mechanical pump.
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Old 04-20-2012, 10:21 PM   #4 (permalink)
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alright. i was pretty sure thats what i was gonna have to do. i was just trying to make my life a little easier.

did you put a carbed 350 in your yj?
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Old 04-21-2012, 12:59 PM   #5 (permalink)
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alright. i was pretty sure thats what i was gonna have to do. i was just trying to make my life a little easier.

did you put a carbed 350 in your yj?
AMC 401. Motorcraft carb. Edelbrock mechanical fuel pump.

Although it's now converted to GM TBI.
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Old 04-21-2012, 06:46 PM   #6 (permalink)
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I can still keep the stock fuel guage when i take out the pump though right? should i just use a host that is the same ID as the gas line into the fuel pump?
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Old 04-21-2012, 08:34 PM   #7 (permalink)
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I can still keep the stock fuel guage when i take out the pump though right? should i just use a host that is the same ID as the gas line into the fuel pump?
Yep, thats right. The pump is on the same carrier as the fuel sender. Just pull the pump, replace with a length of hose. Might want to install some kind of heavy nut on the end of the hose to make sure it stays on the bottom of the tank though.
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Old 04-22-2012, 08:22 PM   #8 (permalink)
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i heard ethanol will eat a normal rubber hose. should i just use steel or will ethanol not eat a rubber hose?
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