No Fuel. Testing Fuel Pump and CCRM Pinouts? Help?!
03-19-2012, 09:32 PM
#1
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Join Date: Dec 2006
Location: Sacramento, California
Posts: 411
No Fuel. Testing Fuel Pump and CCRM Pinouts? Help?!
Ok, so my new to me 94 GT died while AT THE DANG SMOG STATION! Just bought the thing, took it to be smogged, and it died. The stupid techs added 5 gallons of fuel...which I got charged full price for. They call me and say, we dont know whats wrong with your car, you need to come look at it. Funny thing is this is a mechanics shop too. I come by, stick the key in the ignition and twist...fuel pump doesnt come on. Big surprise. I look under the hood and the 20 amp fuse for the fuel pump is fine. So, I need to test my CCRM, but I don't know what/where exactly to test because I cant read those stinking wiring diagrams. I have these directions I found online.
"With the key turned to run and checking within the fuel pump prime-out period
(a duration of 2-5 seconds after turning the key to run): Check CCRM pin 5 for accessory 12 volts. If you have it, the issue lies downstream. If not: Check CCRM Pin 11 for constant 12 volts. Check CCRM Pin 13 for accessory 12 volts. Check CCRM Pin 18 for a ground signal during the prime-out."
So, if the CCRM is good, I then need to test my Fuel pump. Is that accessible under the back seat or do I have to drop the tank to test it?
"With the key turned to run and checking within the fuel pump prime-out period
(a duration of 2-5 seconds after turning the key to run): Check CCRM pin 5 for accessory 12 volts. If you have it, the issue lies downstream. If not: Check CCRM Pin 11 for constant 12 volts. Check CCRM Pin 13 for accessory 12 volts. Check CCRM Pin 18 for a ground signal during the prime-out."
So, if the CCRM is good, I then need to test my Fuel pump. Is that accessible under the back seat or do I have to drop the tank to test it?
03-19-2012, 10:09 PM
#3
2nd Gear Member
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Join Date: Dec 2006
Location: Sacramento, California
Posts: 411
I kicked the crap outta the back of the tank with my foot. Ill try a mallet to the bottom tomorrow. But I still need to know about the CCRM. Also, since theres no access under the seat, is there a place I can jumper the fuel pump without dropping the tank?
Last edited by rwdfan; 03-19-2012 at 10:12 PM.
03-19-2012, 10:28 PM
#4
You should be able to get to the wires somewhere. I am not sure where the inertia switch is but, it will run out of it. On a fox, it is in the trunk.
Look for a pink/black wire. That is the hot for the fuel pump. If it has voltage, you know what the problem is.
Look for a pink/black wire. That is the hot for the fuel pump. If it has voltage, you know what the problem is.
03-19-2012, 10:45 PM
#5
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Join Date: Dec 2006
Location: Sacramento, California
Posts: 411
Thanks for the info on the wiring for the inertia switch. That will work perfectly for testing the fuel pump. Since no one is forthcoming with the CCRM info, Ill test the fuel pump first, if it has no voltage I'll have to test the CCRM. Oh and FYI, the inertia switch on these is in the trunk adjacent to the drivers side tail light area. Thanks TrimDrip
Last edited by rwdfan; 03-19-2012 at 10:48 PM.
03-22-2012, 01:34 AM
#9
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Join Date: Dec 2006
Location: Sacramento, California
Posts: 411
It sat for 3 months before I bought it. I went and bought a Walbro 255 GSS340 in anticipation of major upgrades. Im hoping I dont have to disconnect the rubber fuel filler neck hose to get the fuel pump out. I dropped the tank and I have it propped up, we shall see. I hear they can crack. I checked on a new OEM replacement, 165$!!! If it does break, Im going to see if a generic dorman one will fit.
Last edited by rwdfan; 03-22-2012 at 01:39 AM.
03-22-2012, 06:20 AM
#10
On a fox the filler neck slides out of the tank. Super easy
The 94 must have changed. With all that said, I would just make sure I didn't knock lots of dirt in the tank while doing this. And take an air blower to it before I got the pump out. Personally, I would try to get it off but, I didn't know they were prone to break. I replace fuel pumps all the time and haven't had that problem yet.
I did change one on a 97 one time with no problems.
The 94 must have changed. With all that said, I would just make sure I didn't knock lots of dirt in the tank while doing this. And take an air blower to it before I got the pump out. Personally, I would try to get it off but, I didn't know they were prone to break. I replace fuel pumps all the time and haven't had that problem yet. I did change one on a 97 one time with no problems.
