[Bob Lincoln]

If this is a carbed vehicle, both fuel pressures are fine, close enough. If EFI, it's the wrong pump.

I know the EFI pumps have a 5/16" supply and a 1/4" return line. I don't know the sizes for carbed vehicles.

 

[dana44]

The 8.5psi is the Throttle body injection "carb", the actual carburetor is what you should have, which is what the manual states, no greater than 7.0psi. Another reason the fittings are the wrong size. I would not use the pump without a pressure regulator, and then you are still going to need some fitting adapters, so have them try to get the correct pump.

 

[juma1998]

according to jegs that pump is ONLY FOR carburetor/mechanical pumps only. Absolutely not for an application for EFI.

 

[dana44]

I would go with the max pressure for the FSM, being 7.0psi. Anything above that will overcome the float in the carb, which will give you problems. TBI "carbs" use 7.5-11psi. That kind of answers the whole debate for me. Why not a stock mechanical pump? You can get lifetime guarantees on them and are usually cheap enough.

 

[juma1998]

The reason... I wanted a Mopar Pump. Some of the aftermarket pumps tend to be questionable according to my research. New Old Stock is out on the 5th. So it was Mopar Performance stuff or aftermarket. The MP was actually better priced than some of the DIRECT swap out aftermarket parts.

 

[chuzz]

I've used the Airtex fuel pumps on the small block Mopars over the years and never had one fail. Bought them at Autozone for around $20 or so.

 

[ImperialCrown]

Is this a 2 or 3 port fuel filter? The 3 port had a fuel tank return port that vastly reduced fuel pressure delivery the the carburetor. If a 2 port filter is used in place of a 3 port, the delivery pressure will be way too high.
It may be best to actually try to gently blow through the vapor and return lines as I have seen them rust shut on the inside of the steel tubing while looking fine on the outside.

 

[juma1998]

Is this a 2 or 3 port fuel filter? The 3 port had a fuel tank return port that vastly reduced fuel pressure delivery the the carburetor. If a 2 port filter is used in place of a 3 port, the delivery pressure will be way too high.
It may be best to actually try to gently blow through the vapor and return lines as I have seen them rust shut on the inside of the steel tubing while looking fine on the outside.

3 Port Filter. Brand new. My buddy who came help me when I broke down actually did blow through a few vapor lines. Saw no issues.

 

[dana44]

That's a touch of information that would change things. 3 lines, that is.