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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 05-02-2016
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Fuel pump?

New member to this site. It seems like you guys are a little more active then the small truck division of Ford truck enthusiast. Little background, I have a 1998 4.0 ranger with almost 250,000. It was my daily driver until I had my son and I needed something a little bigger so i got a 2000 f350 7.3L about 2 1/2 years ago. In that time the ranger has pretty much sat. After much research on the forums I decided to tackle my CEL lean codes and replaced my upper and lower intake gaskets, cleaned everything pretty well including the injectors and got it all back together. I wanted to drain the fuel tank and add some fresh fuel to the system so i disconnected the fuel filter, pulled the fuel pump relay and used a jumper wire to power the fuel pump. Nothing happened. I put the relay back in and tried turning the key and nothing happened. I checked the fuel pump cutout switch under passenger dash and it seemed fine. So I'm looking at the fuel pump being shot. I am thinking about pulling the bed to access the fuel tank as opposed to dropping the tank. Ideally I can just replace the pump itself but do you guys think I should replace the whole assembly? Are there other things that are problematic in that assembly that would make it a better choice to replace the whole thing? Do you think the fuel pump is the culprit? The future of the truck is uncertain and it could easily end up at the scrap yard so I would hate to sink too much money into it but part of me wants to have it running and see if the intake work that I did actually worked and is leak free. Thanks for any help.
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Old 05-02-2016
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Did you check for power at the fuel pump relay or inertia switch?

Maybe the 30amp fuel pump fuse is blown?
In engine fuse box.

Yes pulling the bed is best.
Yes you can just replace the pump, senders do fail just not as often as fuel pumps.
I would look at motorcraft pumps, 3rd party will work, just seems to get alot of warranty exchanges on those, yes they do honor the 1 year warranty, but the labor to do the R&R is a tough one to swallow, lol.

Motorcraft have a 30 day warranty, lol, yes they are that good, if it works for 30 days it will work for 10 years


After you get engine started warm it up to operating temp then unplug the wires on the IAC Valve, idle should drop down to 500rpm or engine may stall either is good, no vacuum leaks.
If idle stays high 700+ then you still have a leak
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Old 05-03-2016
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Quote:
Originally Posted by RonD View Post
Did you check for power at the fuel pump relay or inertia switch? Maybe the 30amp fuel pump fuse is blown? In engine fuse box. After you get engine started warm it up to operating temp then unplug the wires on the IAC Valve, idle should drop down to 500rpm or engine may stall either is good, no vacuum leaks. If idle stays high 700+ then you still have a leak
that's a good pointer on the IAC. I had not read that on any of the forums before. I will check for power at the relay. At one point I did try to use my jumper wire to go directly from the battery to the relay slot to power the pump in case that was the issue. The inertia switch seemed to be pressed down which I assumed was the correct position? I figured it would pop out when it's open?
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Old 05-03-2016
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If you jumper the fuel pump relay slots you can also jumper the 2 connectors on inertia switch.

Yes the reset button should pop up if inertia switch has OPENED, and while it can be reset for temporary use it does need to be replace sooner than later with a new one.

And yes any electrical part can fail, so test it before assuming "it works".

The Pink wire on inertia switch runs to fuel pump
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Old 06-29-2016
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Mine is doing the same thing, I replaced the whole pump assembly twice, relay, pressure regulator, cleaned the injectors but the friggin thing still isn't getting fuel, and checked the inertia switch please help!!!!
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Old 06-30-2016
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Originally Posted by steves238stang View Post
Mine is doing the same thing, I replaced the whole pump assembly twice, relay, pressure regulator, cleaned the injectors but the friggin thing still isn't getting fuel, and checked the inertia switch please help!!!!
What year and engine are we talking about?

PATS(passive anti-theft system) was added in the late 1990's and it shuts off fuel system if wrong or old key is used
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