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True Grade fuel pump

1968-Present E-Series Van/Cutaway/Chassis Econolines. E150, E250, E350, E450 and E550

True Grade fuel pump

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Old

Sep 7, 2023 | 04:19 PM

#1

craigdaniel0035

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1st Gear

Joined: Sep 2023

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True Grade fuel pump

I have an external fuel pump for a 1989 ford e-350 econoline van that the positive and negative connections ars not marked. How do i tell which is which ?

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Old

Sep 9, 2023 | 09:42 AM

#2

tabijan

Cargo Master

Joined: Sep 2012

Posts: 2,112

Likes: 286

From: Eastern TN

If inlet and outlet are marked, hook it up to a battery to see which way it moves more volume. It might be a style of pump that’s polarity agnostic but I can’t picture it in my mind. I don’t expect pumping water for a couple of seconds will harm the pump. Maybe try Diesel or light oil. Quickie electrical connections and gasoline vapors aren’t a good idea.

Sixto
07 E350 5.4 195K miles

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Old

Sep 10, 2023 | 09:04 PM

#3

maples01

Lead Driver

Joined: May 2004

Posts: 5,011

Likes: 131

From: Maryville

You sure you can't see a dash mark on it "-" where the wires are, hate to dry test one?

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