Fuel Pump

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Apr 23, 2003 | 07:56 PM

deralaand

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Joined: Apr 2003

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Fuel Pump

1994 F150 4x4 300 six 5 speed

Truck won't start, i installed plugs, wires, cap and rotor.
I have spark.
I suspect fuel pump...I hear the pump when I turn on the ignition but that doesn't mean it's pumping anything.?? I know I can check the fuel pressure at the small valve on the fuel rail. Can I check it with a tire gauge? or not?

If it is my fuel pump how dificult is the job? I'm assuming i'll need to drop the tank. This truck has two tanks.
How much fun am i gonna have and should i skip it and let the $85 an hour pro do it for me?

Any suggestions would be appreciated.

"D"

Apr 23, 2003 | 10:07 PM

steve83

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Joined: Nov 2002

Posts: 9,987

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From: Memphis, TN

Fuel Pump

If you make more than $85/hr, let someone else do it.

It's not that difficult - just tedious & time-consuming. It took me ~3hrs for my mother's Grand Marquis, but it's a lot harder to drop that tank and I was trying to take some shortcuts that didn't work. I think the last time I swapped my truck's tank, it only took ~2hrs.

I wouldn't put a tire gauge on that gas line for lots of reasons. A fuel pressure gauge is only ~$25 @ Sears.

Apr 24, 2003 | 01:32 AM

pfogle

Lead Driver

Joined: Feb 2003

Posts: 8,140

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From: Oak Harbor, OH

Fuel Pump

you can get a high pressure fuel gauge at napa for around 15 bucks.

Apr 24, 2003 | 05:54 PM

jrs_big_ford_f150

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Joined: Oct 2002

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From: Dededo, Guam

Fuel Pump

In your truck you have two pumps. Three if you have dual tanks. The one in the tank is the LOW PRESSURE pump. That feeds into the HIGH PRESSURE pump mounted on the left inner frame rail. The high pressure pump is the one you hear when you turn your key to the on position before you start your truck. It should run for a couple of seconds and then stop when it reaches its operating pressure. It sounds to me that your high pressure pump is good. Usually pumps either work or they don't. There isn't a in between. Check your fuel pressure. Should be around 45 psi (someone please correct me if I am wrong). Check your fuel filter to make sure it ain't clogged.

Apr 24, 2003 | 08:57 PM

steve83

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Joined: Nov 2002

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From: Memphis, TN

Fuel Pump

He only has one pump in each tank ('91-up); no pump on the frame rail ('84-90).

Apr 24, 2003 | 09:08 PM

jrs_big_ford_f150

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Joined: Oct 2002

Posts: 1,301

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From: Dededo, Guam

Fuel Pump

Thanks for the info Steve, I didn't know that 91 and up only used one pump in the tank. I stand corrected.

Apr 25, 2003 | 01:09 AM

eckart

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Joined: Dec 2001

Posts: 582

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From: Kelowna B.C.

Fuel Pump

If you hear the pump running odds are its pumping. Check your presure. Bad regulator or leaking rail and you wont have enough presure to fire your injectors.