6.8L Fuel Pump Problem
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Mountain Pass
Joined: Oct 2005
Posts: 225
Likes: 24
6.8L Fuel Pump Problem
Van popped up "service engine soon" light while driving down highway on vacation. Pulled in to local dealer had mass airflow sensor and pcv replaced as this is what was wrong. Now, three days later it pops up again. This time take it to home town dealer and says it's fuel pump. Would it be different code reading to have distinguished that in the first place or possibly coincidental both situations happened anyway? Mileage: 169,000. Never replaced pump or other items before.
Fleet Mechanic
Joined: Aug 2004
Posts: 1,276
Likes: 7
From: NE Tennessee
How is your full throttle acceleration? Is it falling on its face at high demand (off idle punch or high rpm)? What year are we talking about? A fuel pressure gauge will tell you a lot about the issue and make sure they are right before you drop the money to fix it (fuel filter changed recently). If you do fix it remember to buy a good pump as you don't want to do it again for another 160k. Some later years the OBD reader will tell you fuel pressure and you won't have to use a gauge. PCV and mass air sensor shouldn't be in the same code ballpark especially if it fixed your code after they replaced it but they may have reset it and not got triggered again for a few days. What were the original symptoms when it gave you the first service soon light? Hesitation? Smoking? Low power? Funky rich/lean smell?
Thread Starter
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Mountain Pass
Joined: Oct 2005
Posts: 225
Likes: 24
How is your full throttle acceleration? Is it falling on its face at high demand (off idle punch or high rpm)? What year are we talking about? A fuel pressure gauge will tell you a lot about the issue and make sure they are right before you drop the money to fix it (fuel filter changed recently). If you do fix it remember to buy a good pump as you don't want to do it again for another 160k. Some later years the OBD reader will tell you fuel pressure and you won't have to use a gauge. PCV and mass air sensor shouldn't be in the same code ballpark especially if it fixed your code after they replaced it but they may have reset it and not got triggered again for a few days. What were the original symptoms when it gave you the first service soon light? Hesitation? Smoking? Low power? Funky rich/lean smell?
Senior User
Joined: Nov 2014
Posts: 329
Likes: 2
My 97 5.4 runs about 28psi at idle, 38 under load. That's normal for these. Maybe low normal. Not 60. Dealer should know that.
I added a FP gauge on the pillar to chase a lean condition that turned out to be a MAF.
Walbro makes a kit for the vans. 2 kits - a normal and a Hi-Perf. I assume 99 V10 is same as 97 V8 but I could be wrong.
I bought mine here: Fuel Pump Lookup from Fuel-Pumps.net and never installed it. It's a spare now. 240K miles on the original.
What codes are you getting?
There's now "bad fuel pump" code but lean codes could indicate a failing pump.
I added a FP gauge on the pillar to chase a lean condition that turned out to be a MAF.
Walbro makes a kit for the vans. 2 kits - a normal and a Hi-Perf. I assume 99 V10 is same as 97 V8 but I could be wrong.
I bought mine here: Fuel Pump Lookup from Fuel-Pumps.net and never installed it. It's a spare now. 240K miles on the original.
What codes are you getting?
There's now "bad fuel pump" code but lean codes could indicate a failing pump.
Thread Starter
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Mountain Pass
Joined: Oct 2005
Posts: 225
Likes: 24
So, work was completed by dealer. Transfer flow has replacement filter which is $99 but it is nothing special per se for the tank itself. Dealer installed comparable, upper grade one plus filter and relay. Two of the MAF sensors they installed failed and the searched out an OEM Ford, shipped it in from Louisiana and installed. That worked. PCV valve replaced. Codes they found were as follows: P0171, P0174 lean both banks. P0102 MAF. All those codes cleared with work done. HOWEVER! They are still getting P0605- PCM memory failure code. Check engine light not coming on though. They suggested if it does, replace PCM. Note: I installed Superchips chip years ago and everything has worked fine until now. Now I'm wondering how this PCM thing will play out. If it is still throwing that code, is future failure likely? How easy is it to find a PCM for a '99 now?
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