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HDGENE
HDGENE, Ford Senior Master/Diesel/Trans
Category: Ford
Satisfied Customers: 4933
Experience:  25 years Auto experience, Ford ,GM, Chrysler, Asian & European
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No fuel pump pressure, its the orignal one, 98 ford ranger,

Customer Question

no fuel pump pressure
JA: Have you ever replaced the fuel pump, or is this the original?
Customer: its the orignal one
JA: What is the model/year of your Ford?
Customer: 98 ford ranger
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: yes and checked fuel pump i put 12v to it and it runs checked all the fuses and switched the relays around and nothing it was running a few day ago now it wont run
JA: Anything else you think the mechanic should know?
Customer: no thats it
Submitted: 6 months ago.
Category: Ford
Expert:  HDGENE replied 6 months ago.

Hello, when you turn the key to on does the check engine light come on and do you hear the fuel pump run for a few seconds? Have you checked the fuel pump inertia switch for being popped? Any codes stored if checked with a scan tool?

Customer: replied 6 months ago.
Is the interim switch pose to be up or down
Customer: replied 6 months ago.
Interia*
Expert:  HDGENE replied 6 months ago.

The button is supposed to be in the down position or it interrupts power to the fuel pump. On a ranger sometimes a passenger can pull the electrical connector out of the bottom of the switch or the switch can fail. Make sure the check engine light comes on, the eec power relay turns on the check engine light to indicate power is going to the PCM. The eec power relay then supplies power to the fuel pump relay for a few seconds to energize the pump and prime the fuel rail. The power goes from the pump relay to the inertia switch to the pump.

Customer: replied 6 months ago.
Ok I'll check that tomorrow
Expert:  HDGENE replied 6 months ago.

Yup, if you got no power going to the pump and the inertia switch is plugged in and button is down. CHeck for power to the switch when you turn the key to on. It only sends power for a few seconds so you might need an assistant to turn the key. If the check engine light doesnt come on, change the eec/pcm power relay. if it does and no power, swap out the fuel pump relay if it has 2 sources of power to the relay when the key is cycled to on.

Customer: replied 6 months ago.
No check engine light on
Expert:  HDGENE replied 6 months ago.

Then check for two power sources at the eec/pcm power relay. If there is no power, check the fuses. If you have two power sources swap out the relay and retest, assuming the check engine light bulb isnt burnt out and worked before.

Customer: replied 6 months ago.
They both have 12v is it possible that the relay is bad or the pcm the radio doesn't work now either
Expert:  HDGENE replied 6 months ago.

Yes, as i said, if you have 2 sources of power to the relay, try swapping the relay and testing operation.

Customer: replied 6 months ago.
Did that and still nothing
Expert:  HDGENE replied 6 months ago.

Do you have communication with the pcm if you test it with a scan tool?

Expert:  HDGENE replied 6 months ago.

With the key in the on position and you install the eec/pcm power relay does it click?

Customer: replied 6 months ago.
No communication with scan tool
Expert:  HDGENE replied 6 months ago.

Ok and does the pcm power relay click? You are positive you have 2 pins on the relay in the fuse box that have power? The relay doesnt click?

Customer: replied 6 months ago.
Sorry only one pin has source voltage
Expert:  HDGENE replied 6 months ago.

Ok then that is why it wont close the relay. What engine is in this ranger?

Customer: replied 6 months ago.
V6 3.0
Expert:  HDGENE replied 6 months ago.

Ok check the fuses for the pcm power relay as shown in this and the next attachment

Expert:  HDGENE replied 6 months ago.

here is the fuse in the interior fuse panel that feeds the pcm power relay diode side of the relay circuit. both should be good. if no power, replace he fuse. if the fuse is good, you will need to disassemble the pcm power relay fuse box and test the wiring for an open circuit and repair the loss of power

Expert:  HDGENE replied 6 months ago.

Do you need more help with this concern?

Expert:  HDGENE replied 6 months ago.

If you need more help or information, let me know. If I was helpful,please leave a positive rating.

Expert:  HDGENE replied 6 months ago.

Hello, do you need more help with this concern?