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I was curious as to how quickly the fuel pressure built from the time "key on" triggers the lift pump to turn on until stable engine idle. Viewing it half speed shows a smooth start which was very hard to see in real time. Initially the fuel rail pressure shows approx 300 psi with only the lift pump on. That seems a little high to me, so I am trying to find the PID for the lift pump discharge pressure.
The truck turns over at about the 11 second mark.
Lift pump pressure PID in Forscan for PC is named FLP, description is Low Side Fuel Pressure.
I would assume pids are named the same in Forscan Lite.
I just did the same test as you, but let the truck sit key on engine off until the lift pump timed out.
Key on engine off, Lift pump pressure of 78PSI, Fuel Rail pressure readings bouncing around between 107.3 and 169.7. No values in between, just back and forth between those two.
Then, after exactly 30 seconds of the key being on with engine not running, the lift pump timed out, and lift pump pressure fell down to about 14 psi. During that time as the lift pump pressure was falling off, Fuel rail pressure dropped to 50.8 before bouncing back around at 107.3.
I then cranked the engine after the lift pump pressure had fallen off. Lift pump pressure shot to 78psi, and then 82 psi, and fuel rail pressure spiked at about 10k during start before settling in to 5600 psi at idle.
Lift pump pressure PID in Forscan for PC is named FLP, description is Low Side Fuel Pressure.
I would assume pids are named the same in Forscan Lite.
I just did the same test as you, but let the truck sit key on engine off until the lift pump timed out.
Key on engine off, Lift pump pressure of 78PSI, Fuel Rail pressure readings bouncing around between 107.3 and 169.7. No values in between, just back and forth between those two.
Then, after exactly 30 seconds of the key being on with engine not running, the lift pump timed out, and lift pump pressure fell down to about 14 psi. During that time as the lift pump pressure was falling off, Fuel rail pressure dropped to 50.8 before bouncing back around at 107.3.
I then cranked the engine after the lift pump pressure had fallen off. Lift pump pressure shot to 78psi, and then 82 psi, and fuel rail pressure spiked at about 10k during start before settling in to 5600 psi at idle.
Thanks for the PID reference for the lift pump! Interesting to see your values compared to mine. My lift pump starts a around 55 psi and spikes to 65 psi as the truck cranks. Fuel rail pressure jumps to around 4000 and settles right around the same at idle.
I watch my DFCM pressure on my iDash 1.8. when I'm driving it varies from about 82psi to 86psi. Not that matters to you guys, but it's "LIFT P PSIG." I use it to watch for pressure drop in case something happens with the lift pump filter or both. I let my fuel filters go out close to the recommended change interval. Just FYI.
I watch my DFCM pressure on my iDash 1.8. when I'm driving it varies from about 82psi to 86psi. Not that matters to you guys, but it's "LIFT P PSIG." I use it to watch for pressure drop in case something happens with the lift pump filter or both. I let my fuel filters go out close to the recommended change interval. Just FYI.
I believe while driving the pressure is about 65-70 psi. I'll have to look at this next time. I haven't been able to find "LIFT P PSIG". Maybe this is because of iDash vs ForScan Lite
I believe while driving the pressure is about 65-70 psi. I'll have to look at this next time. I haven't been able to find "LIFT P PSIG". Maybe this is because of iDash vs ForScan Lite
Right, because Lift P PSIG is the iDash PID. In forscan it's FLP.
Your Lift pump pressure while driving seems low. What's the status of your filter?
Right, because Lift P PSIG is the iDash PID. In forscan it's FLP.
Your Lift pump pressure while driving seems low. What's the status of your filter?
fuel filter has a little over 10K miles and I usually do 15 to 20K mile intervals. you and @Overkill2 both are around the same pressure and have 1st gen trucks. Mine is a 2nd gen so hopefully that is the difference. I'll change the filters in a few thousand miles and report back. Thanks for pointing out the pressure differences!
fuel filter has a little over 10K miles and I usually do 15 to 20K mile intervals. you and @Overkill2 both are around the same pressure and have 1st gen trucks. Mine is a 2nd gen so hopefully that is the difference. I'll change the filters in a few thousand miles and report back. Thanks for pointing out the pressure differences!
Maybe it does have to do with the newer gen and the different DFCM the 17s and up have.
you and @Overkill2 both are around the same pressure and have 1st gen trucks. Mine is a 2nd gen so hopefully that is the difference.
Technically they are both 2nd generation engines. But I get what you mean since the DFCM is different on the 17+ trucks. FYI I use Torque Pro and I see the same pressures as Overkill and MJS. I'm curious to hear if the 17+ have lower lift pump pressures as well.
6.7L Powerstroke
Gen 1 - 11-14
Gen 2 - 15-19
Gen 3 - 20-21
Ford Super Duty
Gen 1 - 99-07
Gen 2 - 08-10
Gen 3 - 11-16
Gen 4 - 17-Present
Technically they are both 2nd generation engines. But I get what you mean since the DFCM is different on the 17+ trucks. FYI I use Torque Pro and I see the same pressures as Overkill and MJS. I'm curious to hear if the 17+ have lower lift pump pressures as well.
6.7L Powerstroke
Gen 1 - 11-14
Gen 2 - 15-19
Gen 3 - 20-21
Ford Super Duty
Gen 1 - 99-07
Gen 2 - 08-10
Gen 3 - 11-16
Gen 4 - 17-Present
thanks for the clarification. yeah I meant to distinguish between the different DFCM of the trucks. I hope some others will report their lift pump pressures. I might make a call on a separate thread
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