How Test Fuel Pump? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 01-16-2007, 09:10 PM   #1 (permalink)
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How Test Fuel Pump?

I was wondering if somebody could tell me an easy way to test the fuel pump without a pressure gauge? I've heard to turn the key on for 15 seconds and see how much fuel comes out the fuel filter drain tube. Should it be about a quart and will this work? Thanks for any help I can get! BRIAN
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Old 01-16-2007, 09:22 PM   #2 (permalink)
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Re: How Test Fuel Pump?

[ QUOTE ]
I was wondering if somebody could tell me an easy way to test the fuel pump without a pressure gauge? I've heard to turn the key on for 15 seconds and see how much fuel comes out the fuel filter drain tube. Should it be about a quart and will this work? Thanks for any help I can get! BRIAN

[/ QUOTE ]That would work fine...
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Old 01-16-2007, 09:41 PM   #3 (permalink)
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Re: How Test Fuel Pump?

a quart in 15 seconds? is that correct... mine must be weak... that would explain why the truck looses power and eventually dies within the first 5 miles of highway driving..


Glad I checked the ofrums tonight..
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Old 01-16-2007, 10:09 PM   #4 (permalink)
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Re: How Test Fuel Pump?

Just checked my fuel pump output. Had more fuel come out while draining the fuel filter than came out in 15 seconds with the key on. Guessing about a pint in 15 seconds. Also, should I be hearing gurgling or it almost sounds like air in the lines near the pump with it running? Also, what kind of pressure guage would I need to check actual fuel pressure? Should it be around 50psi? Could I hook something up to the end of the fuel drain tube? Thanks again!
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Old 01-16-2007, 10:17 PM   #5 (permalink)
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Re: How Test Fuel Pump?

[ QUOTE ]
Just checked my fuel pump output. Had more fuel come out while draining the fuel filter than came out in 15 seconds with the key on. Guessing about a pint in 15 seconds. Also, should I be hearing gurgling or it almost sounds like air in the lines near the pump with it running? Also, what kind of pressure guage would I need to check actual fuel pressure? Should it be around 50psi? Could I hook something up to the end of the fuel drain tube? Thanks again!

[/ QUOTE ]I read here that some just use a tire guage on the schraeder valve.....I don't know how accurate it is ...
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Old 01-16-2007, 10:19 PM   #6 (permalink)
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Re: How Test Fuel Pump?

Some guys have said they hooked up a gauge to the end of the fuel drain line, but I think it you did that, you'd blow fuel all over the valley. The drain valve is a 2 function affair, the lower part is the drain valve, and the upper part is a vent into the shaft of the valve so that it will drain. (Prevents the upside-down glass full of water effect.) Also, there's a short section of hose slip fit between the valve and the drain tube that may blow off.

You can plumb a 0-100 psi gauge into the back of the filter housing to check pressure. There's a boss 0-ring plug there (same size as the plug on the HPOP reservoir). Get an adapter from boss o-ring to pipe thread, then an elbow and a short length of hose w/fittings from a hydraulics shop and screw your gauge on there.

You could also do it at the front of the passenger side head, but the 1/8" pipe plug there is a PITA to get at. Similarly, the plug on the rear of the driver's side head is hard to get at.

[ QUOTE ]
I read here that some just use a tire guage on the schraeder valve.

[/ QUOTE ] That would be fairly accurate, but there's no schrader valve on SuperDuty trucks. [img]/ubbthreads/images/graemlins/frown.gif[/img]
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Old 01-16-2007, 10:27 PM   #7 (permalink)
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Re: How Test Fuel Pump?

What pressure should it be?

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Old 01-16-2007, 10:27 PM   #8 (permalink)
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Re: How Test Fuel Pump?

Somewhere around 50 psi.
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Old 01-17-2007, 01:05 AM   #9 (permalink)
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Re: How Test Fuel Pump?

Just take the fuel return line off and see if you get any fuel out of the fuel filter housing. Fuel out when the pump's running means you've got enough pressure to overcome the spring and ball in the regulator. 50+ or so. If fuel keeps coming out for awhile after the pump quits, you've got something wrong with the regulator spring.

Check the inlet connection to the pump - notorious for allowing air into the system.

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