teletekman
Active Member
- Joined
- July 16, 2012
- Messages
- 72
- Reaction score
- 1
- City, State
- Madera, CA
- Year, Model & Trim Level
- 1992 Ford Explorer XLT
So in addition to my cooling issue I am working on, I wanted to throw out another issue I am having with my Ex.
I have been seeing quite a decrease in fuel mileage lately (10-12mpg) with normal driving down from the 16 to 18mpg I was getting before and while it may have something to do with my cooling temp fluctuating high & low and possibly dumping more fuel when it reads low, I decided to throw my buddies HF fuel pressure gauge on it. During a KOEO test, I noticed about 36psi on the gauge. However I started to notice a drop off to about 22psi over about 15 to 20 seconds. It will eventually drop to the 0 over a while. During KOER it sits at about 32psi and holds steady.
I know from past experience that a typical bleed-off should be nowhere near this quick and from reading some other forum posts on here some have attributed it to a possible leaky check valve, leaky injector or FPR fault. Before I drop the tank to check the check valve, I checked the FPR and its holding 15 inch pounds for a good amount of time, so I would assume that it's working correctly.
Fuel filter is new and I do not smell gas anywhere around the engine nor around the quick-disconnect fittings of the filter so no leak I would think. If it was a leaky injector, wouldn't it run rich? No codes are thrown either.
The Ex does not sputter nor run rough cold or warmed up but I do notice a slight hesitation during up hill driving.
I understand pretty much how an FPR operates and got the system to 36psi, put my finger over the vacuum line connection of the FPR and while I did notice the bleed-off slowed a bit, it still eventually dropped as I stated before. All vacuum lines appear to be fine.
Have I ruled out enough to determine my FPR is ok and should I be thinking about replacing the fuel pump assembly? I ordered an OTC fuel pressure tester to rule out that cheap HF gauge since alot of people have complained about it leaking.
Thanks,
Sean
I have been seeing quite a decrease in fuel mileage lately (10-12mpg) with normal driving down from the 16 to 18mpg I was getting before and while it may have something to do with my cooling temp fluctuating high & low and possibly dumping more fuel when it reads low, I decided to throw my buddies HF fuel pressure gauge on it. During a KOEO test, I noticed about 36psi on the gauge. However I started to notice a drop off to about 22psi over about 15 to 20 seconds. It will eventually drop to the 0 over a while. During KOER it sits at about 32psi and holds steady.
I know from past experience that a typical bleed-off should be nowhere near this quick and from reading some other forum posts on here some have attributed it to a possible leaky check valve, leaky injector or FPR fault. Before I drop the tank to check the check valve, I checked the FPR and its holding 15 inch pounds for a good amount of time, so I would assume that it's working correctly.
Fuel filter is new and I do not smell gas anywhere around the engine nor around the quick-disconnect fittings of the filter so no leak I would think. If it was a leaky injector, wouldn't it run rich? No codes are thrown either.
The Ex does not sputter nor run rough cold or warmed up but I do notice a slight hesitation during up hill driving.
I understand pretty much how an FPR operates and got the system to 36psi, put my finger over the vacuum line connection of the FPR and while I did notice the bleed-off slowed a bit, it still eventually dropped as I stated before. All vacuum lines appear to be fine.
Have I ruled out enough to determine my FPR is ok and should I be thinking about replacing the fuel pump assembly? I ordered an OTC fuel pressure tester to rule out that cheap HF gauge since alot of people have complained about it leaking.
Thanks,
Sean