2003 Ford Ranger Won't Start after Fuel Pump install?

About 2 weeks ago, I replaced the fuel filter and all 6 spark plugs to do some regular maintenance and upkeep. 3 days ago, hard to start. Had to turn key a couple times to prime- then would fire right up.
Replaced fuel pump yesterday, now I have no start at all. It just cranks, and barely starts to turn over, only to bog out. When it starts to bog out, i tap the gas to try and get my RPMS up, but I have no throttle response at all.

Did you change the fuel filter? Sounds like its clogged up, which happens when the fuel pump goes out quite often.

If the vehicle shows signs of not getting fuel immediately after replacing the fuel pump, you may have gotten a defective fuel pump. It is also possible that the wiring to power the pump is loose or damaged. As you had to open the lines to replace the pump, it is also possible something got into the line and clogged the filter.

@Ben_Gazzi:

Yes, I did replace the fuel filter- but prior to the pump installation.

@STEVEN F:

I checked all fuses and relays and can hear the pump run when i turn the key. Still possible?

It sounds like your battery is drained not enough power to turn the engine fast enough. Try a jump start since your fuel pump is electrical I wouldn't concern about trottle fuel should reach engine when you turn the key to the on position.

Return the pump or do a test on it to see if its working properly.
Maybe look at you're fuel pressure regulator to see if thats working at all too.
And is it the right pump for the truck
Also should mention its not your battery if it will start then stall, if it doesn't start at all or clicks, then youd look at it.

Could be you have a bad computer. Go to Auto Zone have them do a check on the computer to see if you have a problem with one injector side. It should read number 1 not enough fuel as you have fuel injection. Or it may need to be cleaned.

Start properly diagnosing things. I'm not cracking wise or being a smart ****, but I'm not there looking at it, and even if I was, I don't know the exact things you have and have not done.

From what you describe, to me this sounds more a pressure issue than a flow issue. What I mean by this, is that logically, some fuel must be flowing for the engine to fire, even if it does starve and splutter. However, without properly pressurizing the fuel rail, the thing will barely idle, much less run at any decent rpm or loads.

I would start by checking your work. Get a cheap nasty $20 voltmeter. And start checking voltages. Check your connections are clean and tight. If you suspect a pooh connection anywhere, do a voltage check (google how) across that connection. This includes ground connections to the chassis. No more than 0.2V drop across any connection anywhere between the relay, fuel pump & ground.

If everything is hunky-dory electrically, start by doing a flow test. All you need is a stopwatch, bucket and workshop manual. If this is significantly below normal, start looking for kinked lines or other restrictions between the tank and the fuel rail. Including something covering the pickup strainer on the end of the fuel pump. If that all checks out, beg, borrow or buy a decent pressure gauge and check fuel pressure at the rail and compare it to specifications. If everything downstream of the fuel rail is fine, test the fuel pressure regulator.

Either the fuel pump, starter gears, or starter motor is worn.

" It just cranks, and barely starts to turn over"

Which is it?

A vehicle cranks when the starter turns the engine crankshaft.

A vehicle "turns over" when the engine internal resistance is overcome by the starter turning the crankshaft.

Then, you must have fuel pressure, volume, and fuel delivery.

Then the engine must be timed by its internal parts.

Spark would be nice at that time. Fuel pressure, volume, delivery may be dependent upon spark being enabled and happenning.

Retrace your previous work since your attempts resulted in greater loss of operation.
Do the basics, verify and run tests/ inpection for spark, fuel, compression, and timing.
In that order, first.
Basic electrical, connections, protections, relays.
Run codes and test, or enter testing in the service manual strictly by symptom.
Update your question.
You can tell us what engine and trans you have then, how many tanks, and if its a 4x4.
You will find on any ford pickup these facts are very important.
also wheelbase and or specific build date make a difference
for fuel system parts in use.
Not using Ford parts opens another interesting chapter into
running one without a carter fuel pump.
Libraries and the Ford garage can be a help.