PaxtonGT05
Junior Member
I'll try to keep a long story short:
Installed a Paxton 2200 kit on my 2005 Mustang GT, with FR 39/lb injectors, and Deatschwerks 340 lph fuel pump.
Car fired up, but had a fuel level error showing an empty tank. I have read about this happening due to sulpher build up on the sensor. Went to get gas as well as adding Chevron Techron to hopefully clean the level sensor. The car cranked but wouldn't start. Let the car sit for about 10 minutes then it fired up.
After doing multiple test hits/data logs, I was noticing a lean AFR, as well as DROPPING fuel pressure while under boost. The boost gauge was reaching about 8 psi near redline, and AFR was in the mid 12's. The fuel pressure in the logs was around 40psi at cruise, but going wide open throttle it would fluctuate from 32-37psi. I thought boost was supposed to increase fuel pressure so I was concerned. Contacted the tuner, they assured me the tune was all good for my setup and after looking at my logs. Changed the fuel filter but no help.
Now the fun part, I take the car on a trip to Ocean City MD, and while I'm pulling from a stop light in downtown D.C. the car shuts off. Car cranks hard but no start. Fuel is a bit low and does have a weird smell at this point but plenty to run the car. Long story short I got the car running the next day, I ordered a CarQuest factory style Fuel pump and put it in. No start... so I recheck everything and notice the DW fuel pump blew the fuel pump fuse when it died. So, I replace the fuse and the car fires up, I test the DW pump one more time and it is definitely dead.
So, I'm thinking, good to go I just need a replacement DW pump and I should be seeing safe AFR's. I did a few small pulls and the CarQuest pump was actually showing better AFRs in lower RPMS in boost, then of course leaning out up top as expected. Another note: while trying to fix the car in D.C. I went ahead and replaced the fuel pump drive module as well for good measure.
PART 2:
Once I get to Ocean City, the car is running great, other than a slight rough idle, the RPMS would drop down to about 500 then correct up to 800 or so, which never happened before. I was thinking maybe just different elevation or something. Car ran great all weekend, other than the slight hesitation in idle, occasionally.
The other BIG issue:
I'm headed back to TN from Maryland, and in VA the car sputters on the interstate and just shuts off. I try cranking a few times and it would start then die. So, I check the fuse and it's good. I start freaking as I'm in the middle of nowhere. I finally look down in the fuel tank on the driver side and notice NO GAS, BUT, there is gas in the passenger side????? The CarQuest pump does have a different looking siphon style to it to bring fuel over from passenger side. However, it was obviously not working. So, I'm thinking a possible clog in the crossover tube in the tank, partially because when I look down in the passenger side, there is DEBRIS floating in the gas, small particles and some large. I use a cup to transfer the fluids from one side of the tank to another to start the car. From there on, the car would drive normally, other than a slight hesitation at 70-80mph which seemed fuel related. At this point I'm thinking there is a clog in the system from that damn debris, or the CarQUest pump in on it's way out now. Data logging showed normal Fuel pressure duty cycle and pressure though. Had to fillup every 150 miles on the way home.
WHERE I'M AT NOW:
I'm working on cleaning the gas tank out of any possible debris, I'm going to replace the fuel filter again since seeing the debris, and I'm going to use compressed air in all the fuel lines if any debris. I'm starting to wonder if the Techron cleaner loosened the tank up and caused debris, or if I got a bad batch of gas in a small town. I still believe the orignal DW fuel pump I got was just bad from the get-go, as it had a lower fuel pressure with key on than the CarQuest pump, which is pretty sad. Key on showed the DW pump at 45psi rail pressure and Carquest at 65psi.
After cleaning everything, I'm going to install the new DW fuel pump. I wanted to use the CarQuest sending unit as it actually makes the fuel gauge work again, and has a PPRV delete, however, it doesn't seem to have the same connector as the stock unit. I'm thinking both incidents were not related. The first issue seemed like a weak pump from the factory that eventually just died. The second instance seems like a clog in the tank/lines. I'm going to tackle most of this, this weekend. What I'm hoping is the first DW pump was faulty and caused the fuse to blow. And then the tank got a little dirty causing my crossover to clog/slight hesitation at highway speeds since installing stock style pump.
I'm looking for any/all suggestions, tips.
Thank you
Installed a Paxton 2200 kit on my 2005 Mustang GT, with FR 39/lb injectors, and Deatschwerks 340 lph fuel pump.
Car fired up, but had a fuel level error showing an empty tank. I have read about this happening due to sulpher build up on the sensor. Went to get gas as well as adding Chevron Techron to hopefully clean the level sensor. The car cranked but wouldn't start. Let the car sit for about 10 minutes then it fired up.
After doing multiple test hits/data logs, I was noticing a lean AFR, as well as DROPPING fuel pressure while under boost. The boost gauge was reaching about 8 psi near redline, and AFR was in the mid 12's. The fuel pressure in the logs was around 40psi at cruise, but going wide open throttle it would fluctuate from 32-37psi. I thought boost was supposed to increase fuel pressure so I was concerned. Contacted the tuner, they assured me the tune was all good for my setup and after looking at my logs. Changed the fuel filter but no help.
Now the fun part, I take the car on a trip to Ocean City MD, and while I'm pulling from a stop light in downtown D.C. the car shuts off. Car cranks hard but no start. Fuel is a bit low and does have a weird smell at this point but plenty to run the car. Long story short I got the car running the next day, I ordered a CarQuest factory style Fuel pump and put it in. No start... so I recheck everything and notice the DW fuel pump blew the fuel pump fuse when it died. So, I replace the fuse and the car fires up, I test the DW pump one more time and it is definitely dead.
So, I'm thinking, good to go I just need a replacement DW pump and I should be seeing safe AFR's. I did a few small pulls and the CarQuest pump was actually showing better AFRs in lower RPMS in boost, then of course leaning out up top as expected. Another note: while trying to fix the car in D.C. I went ahead and replaced the fuel pump drive module as well for good measure.
PART 2:
Once I get to Ocean City, the car is running great, other than a slight rough idle, the RPMS would drop down to about 500 then correct up to 800 or so, which never happened before. I was thinking maybe just different elevation or something. Car ran great all weekend, other than the slight hesitation in idle, occasionally.
The other BIG issue:
I'm headed back to TN from Maryland, and in VA the car sputters on the interstate and just shuts off. I try cranking a few times and it would start then die. So, I check the fuse and it's good. I start freaking as I'm in the middle of nowhere. I finally look down in the fuel tank on the driver side and notice NO GAS, BUT, there is gas in the passenger side????? The CarQuest pump does have a different looking siphon style to it to bring fuel over from passenger side. However, it was obviously not working. So, I'm thinking a possible clog in the crossover tube in the tank, partially because when I look down in the passenger side, there is DEBRIS floating in the gas, small particles and some large. I use a cup to transfer the fluids from one side of the tank to another to start the car. From there on, the car would drive normally, other than a slight hesitation at 70-80mph which seemed fuel related. At this point I'm thinking there is a clog in the system from that damn debris, or the CarQUest pump in on it's way out now. Data logging showed normal Fuel pressure duty cycle and pressure though. Had to fillup every 150 miles on the way home.
WHERE I'M AT NOW:
I'm working on cleaning the gas tank out of any possible debris, I'm going to replace the fuel filter again since seeing the debris, and I'm going to use compressed air in all the fuel lines if any debris. I'm starting to wonder if the Techron cleaner loosened the tank up and caused debris, or if I got a bad batch of gas in a small town. I still believe the orignal DW fuel pump I got was just bad from the get-go, as it had a lower fuel pressure with key on than the CarQuest pump, which is pretty sad. Key on showed the DW pump at 45psi rail pressure and Carquest at 65psi.
After cleaning everything, I'm going to install the new DW fuel pump. I wanted to use the CarQuest sending unit as it actually makes the fuel gauge work again, and has a PPRV delete, however, it doesn't seem to have the same connector as the stock unit. I'm thinking both incidents were not related. The first issue seemed like a weak pump from the factory that eventually just died. The second instance seems like a clog in the tank/lines. I'm going to tackle most of this, this weekend. What I'm hoping is the first DW pump was faulty and caused the fuse to blow. And then the tank got a little dirty causing my crossover to clog/slight hesitation at highway speeds since installing stock style pump.
I'm looking for any/all suggestions, tips.
Thank you