Ford Escorrt ZX2 Intermittent Fuel Pump Priming


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Ford Escorrt ZX2 Intermittent Fuel Pump Priming

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

sean9721
New User

Dec 27, 2013, 3:50 PM

Post #1 of 5 (2069 views)

Ford Escorrt ZX2 Intermittent Fuel Pump Priming

1998
Ford Escort ZX2
2.0L
136,000 miles

I have a problem with the fuel pump intermittently not priming. I have changed out the Fuel Pump Driver Module and redone the grounds located on the firewall close to the battery. I usually have to cycle the ignition multiple times for the fuel pump to prime. When it does not prime the motor while just crank and not start. I am getting power on the wires coming off the module going to the pump (BLU/BLK and BLU/WHT). I understand that the pump is variable speed. Whatever the issue is, the car does not die out or anything while driving. I have not changed out the fuel pump yet.

I am stumped on this one. Any help would be appreciated.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 27, 2013, 4:01 PM

Post #2 of 5 (2062 views)

Re: Ford Escorrt ZX2 Intermittent Fuel Pump Priming

You really need a bidirectional scan tool to diagnose this system. You don't even have a service port for testing the pressure. You have to read it on the scan tool. The tool will alllow you to manually induce the duty cycle and increase it as necessary while watching the rail pressure sensor to see what it is producing.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Dec 27, 2013, 6:40 PM

Post #3 of 5 (2049 views)

Re: Ford Escorrt ZX2 Intermittent Fuel Pump Priming

Do you have a fuel pressure gauge connected to verify the pump has a priming issue?

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

sean9721
New User

Dec 27, 2013, 8:08 PM

Post #4 of 5 (2041 views)

Re: Ford Escorrt ZX2 Intermittent Fuel Pump Priming

I do not have a gauge connected. The reason I know it's not priming is because I don't hear it prime. When I hear it prime the car starts up. I have the back seat taken out so I can listen for the pump.

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Dec 27, 2013, 8:28 PM

Post #5 of 5 (2039 views)

Re: Ford Escorrt ZX2 Intermittent Fuel Pump Priming

When it doesn't prime is when you need to see if you have power and ground at the pump from the fuel pump module.

Watch parts 1 and 2 of this video. You'll get some good tips diagnosing this thing.

http://www.youtube.com/watch?v=Rwve6lXriO4

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

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