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Unread 09-09-2013, 02:01 PM   #1
kleedian
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1984 CJ7 
 
Join Date: Sep 2013
Location: fort worth, texas
Posts: 20
inline fuel pump?

I just purchased my first jeep, the prior owner changed out motors about 10 yrs ago and dropped in a 4.3 v6 out of 98 chevy. This is strickly going to be an offroad jeep.
According to the hanes book it takes 63 psi for this motor to properly run.

It has 2 inline electric fuel pumps? not sure why. the first one is about 18" from the tank and the other is 2' from the motor. wouldnt it make more sense to just have one pump?

The reason I ask is because one of the pumps is making a lot of noise when the line gets up to pressure.

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Unread 09-09-2013, 02:06 PM   #2
Blakescj7
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1985 CJ7 
 
Join Date: Sep 2013
Location: Tulsa, Ok
Posts: 315
You should only need one pump. You can find inline pumps made for fuel injection on most sites like summit or jegs. I'm assuming that's why you're needing such high psi?
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Unread 09-09-2013, 02:17 PM   #3
kleedian
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1984 CJ7 
 
Join Date: Sep 2013
Location: fort worth, texas
Posts: 20
its a fuel injected motor, i guess thats why it needs so much psi. I have a pump on another car thats carburated an it only needs 4-6 psi
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Unread 09-09-2013, 02:32 PM   #4
Blakescj7
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1985 CJ7 
 
Join Date: Sep 2013
Location: Tulsa, Ok
Posts: 315
First I'd check and see what type of pumps they are. If neither is for FI then ditch them and get one you know the psi rating on. The oem fuel rail should have a fuel pressure port you can check psi with a guage from oreilys or where ever. Check and make sure you're getting the pressure the system is designed for.
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Unread 09-09-2013, 03:19 PM   #5
Spieg8
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1984 CJ8 
 
Join Date: Jun 2013
Location: Denver, CO
Posts: 1,049
2 pumps are common. The one near the tank is probably a low pressure priming pump (these are installed to pull gas out of the tank and get it to the second pump). The pump near the motor is probably the high pressure pump (these are great for pushing a lot of pressure, but don't pull worth a damn... that's why the priming pump is there to get the gas to the high pressure pump). If you had a high pressure pump inside the tank, that would work fine by itself because it only pulls the gas a few inches from the pickup tube.

And it's pretty normal for electric pumps to make some noise.
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