Mudboy
Well-Known Member
- Joined
- July 22, 2010
- Messages
- 233
- Reaction score
- 1
- City, State
- Bellmawr NJ
- Year, Model & Trim Level
- 91 ex
About a week ago when my girlfreind went to start the vehicle she said she wasn't getting any fuel and it wouldn't start, I went out there and it fired right up. Over the past month or so it has been slow starting. There were also a few times where the thing would start and run real ruff for about 15 seconds before clearing out. Slow starting to me sounds like either one of three things. Fuel Filter plugging, fuel injector sticking, or fuel pump not putting out enough pressure. This weekend I was going to change the fuel filter out since I havent done it since I bought the vehicle and have ran the tank pretty low a handful of times. One thing i did do over the weekend was shut off power going to the fuel pump after the vehicle was sitting for an hour or so and it fired up after its 5 seconds of cranking or so. That should be telling me that it held fuel pressure and none of the injectors are leaking by. Well thats by previous conditions.
When i first bought the vehicle the previous owner told me he had to wire in a toggle switch due to fuel pump issues. I never bothered tracing the wires until yesterday when I couldn't get the vehicle to start. They went into the wire that supplies power to the inertia switch( I believe green and yellow). So what it was wired up as was a shut off switch which made no sense to me. I cut out the butt connectors, checked to make sure the switch wasn't tripped and decided to bypass the switch by cutting the other wire (Red i believe) and splicing the two together. still nothing. At this point I was starting to run out of daylight so I ran to the parts store real quick and grabbed a relay and a test light. The aftermarket relay which matched the ford # was a 5 prong compared to the factory 4 prong, however the connector had room for the 5th prong but that port was just a dummy with no wire going to it. I figured this should be fine. I plugged it in and still nothing. The next thing I did was take the test light and made sure I was getting power to the back of the relay at the port were the green and yellow wire that feeds the inertia switch had power. It had power so at that point i believe I provedc out that the relay was good and supplying power to the inertia switch. Next thing i did was unplug the inertia switch and checked to see if i was getting power to it. This is where it started to get weird. With the key off i was getting a very dim light on the test light, when cranking the light got brighter which i expected. I just don't understand why there is a small amount of power going to the inertia switch even with the key off. I'm guessing this why the previous owner wired in a toggle switch because A) the pump waws always running B) it was draining his battery.
Am, i correct when I say that the fuel pump circiut consists of this is this order. 12 volt source from battery to 30 amp fuse to relay to inertia switch to fuel pump? Am I missing anything? also should it be 12 volts all the way to the fuel pump.
Sorry for writing a book but I figured I'd be descriptive.
Thanks.
When i first bought the vehicle the previous owner told me he had to wire in a toggle switch due to fuel pump issues. I never bothered tracing the wires until yesterday when I couldn't get the vehicle to start. They went into the wire that supplies power to the inertia switch( I believe green and yellow). So what it was wired up as was a shut off switch which made no sense to me. I cut out the butt connectors, checked to make sure the switch wasn't tripped and decided to bypass the switch by cutting the other wire (Red i believe) and splicing the two together. still nothing. At this point I was starting to run out of daylight so I ran to the parts store real quick and grabbed a relay and a test light. The aftermarket relay which matched the ford # was a 5 prong compared to the factory 4 prong, however the connector had room for the 5th prong but that port was just a dummy with no wire going to it. I figured this should be fine. I plugged it in and still nothing. The next thing I did was take the test light and made sure I was getting power to the back of the relay at the port were the green and yellow wire that feeds the inertia switch had power. It had power so at that point i believe I provedc out that the relay was good and supplying power to the inertia switch. Next thing i did was unplug the inertia switch and checked to see if i was getting power to it. This is where it started to get weird. With the key off i was getting a very dim light on the test light, when cranking the light got brighter which i expected. I just don't understand why there is a small amount of power going to the inertia switch even with the key off. I'm guessing this why the previous owner wired in a toggle switch because A) the pump waws always running B) it was draining his battery.
Am, i correct when I say that the fuel pump circiut consists of this is this order. 12 volt source from battery to 30 amp fuse to relay to inertia switch to fuel pump? Am I missing anything? also should it be 12 volts all the way to the fuel pump.
Sorry for writing a book but I figured I'd be descriptive.
Thanks.
