New LP is this normal
#1
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New LP is this normal
I finally changed the LP on my 02 2500 4x4 auto. Was reading about 10-11 idle and down to 3 WOT The install was easy enough everything is tight with no leaks new fuel filter as well old filter had only 7000 miles and was clean.
Question is I'm now getting 16psi idle , 12-13 cruising but down to 8 at WOT. Is this pump good or is it bad. Anyway you look at it it's still better than it was and better then the new in-tank pump but I was surprised at the 8-9psi at WOT with no mods, It was a Carter replacement bought at Pep Boys for $175. Is this normal? I keep reading but most can't drag the WOT below 10 with bombs.
Thanks
Bill.
Question is I'm now getting 16psi idle , 12-13 cruising but down to 8 at WOT. Is this pump good or is it bad. Anyway you look at it it's still better than it was and better then the new in-tank pump but I was surprised at the 8-9psi at WOT with no mods, It was a Carter replacement bought at Pep Boys for $175. Is this normal? I keep reading but most can't drag the WOT below 10 with bombs.
Thanks
Bill.
#3
That does sound a touch low.
I have a Carter pump with the Vulcan Relocation and Big Line kit. I never had a baseline for my f/p, cause I installed the Vulcan kit the same day I put the gauges in.
My #'s are
15-15.5 Idle
13.5-14 Cruise
12-13 WOT
STOCK truck, with only exhaust and BHAF.
As I said, I can't tell you what my #'s were so I'm not much help.
I can tell you now that I have what I have, 8 psi would kinda bother me. I would suspect that 8 would/could become 6 or 7 with some fueling mods.
I have a Carter pump with the Vulcan Relocation and Big Line kit. I never had a baseline for my f/p, cause I installed the Vulcan kit the same day I put the gauges in.
My #'s are
15-15.5 Idle
13.5-14 Cruise
12-13 WOT
STOCK truck, with only exhaust and BHAF.
As I said, I can't tell you what my #'s were so I'm not much help.
I can tell you now that I have what I have, 8 psi would kinda bother me. I would suspect that 8 would/could become 6 or 7 with some fueling mods.
#4
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Ya know, I just talked to a Cummins tech that says we are all wet about fuel pressure PSI. It's volume of fuel over PSI. He told me as long as I'm getting 50 oz's per 25 seconds I'm good to go. But I'm replacing it with a FASS II anyway. I just don't like the idea of pulling it down past 5 PSI WOT.
#5
I would buy into that (the volume v.s pressure thing)
Smallest orfice on my system is about 3/8" at the input side of the lift pump.
I think at the very minimun people with increased fuel line diameter see less of a difference in psi between idle and go time. Just measuring the amount of fuel in the lines v.s a stock set up, there is probably about double the volume.
I'm not a scientist or diesel tech, just thinking out loud.
Smallest orfice on my system is about 3/8" at the input side of the lift pump.
I think at the very minimun people with increased fuel line diameter see less of a difference in psi between idle and go time. Just measuring the amount of fuel in the lines v.s a stock set up, there is probably about double the volume.
I'm not a scientist or diesel tech, just thinking out loud.
#6
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So the Vulcan kit sounds good but do I need it with the numbers listed, somehow I killed the money tree in the back yard . I use the truck as a DD and to haul our 7k camper.
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#8
Originally Posted by 2500Ram
So the Vulcan kit sounds good but do I need it with the numbers listed, somehow I killed the money tree in the back yard . I use the truck as a DD and to haul our 7k camper.
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Originally Posted by 2500Ram
I finally changed the LP on my 02 2500 4x4 auto. Was reading about 10-11 idle and down to 3 WOT The install was easy enough everything is tight with no leaks new fuel filter as well old filter had only 7000 miles and was clean.
Question is I'm now getting 16psi idle , 12-13 cruising but down to 8 at WOT. Is this pump good or is it bad. Anyway you look at it it's still better than it was and better then the new in-tank pump but I was surprised at the 8-9psi at WOT with no mods, It was a Carter replacement bought at Pep Boys for $175. Is this normal? I keep reading but most can't drag the WOT below 10 with bombs.
Thanks
Bill.
Question is I'm now getting 16psi idle , 12-13 cruising but down to 8 at WOT. Is this pump good or is it bad. Anyway you look at it it's still better than it was and better then the new in-tank pump but I was surprised at the 8-9psi at WOT with no mods, It was a Carter replacement bought at Pep Boys for $175. Is this normal? I keep reading but most can't drag the WOT below 10 with bombs.
Thanks
Bill.
Starter Bump 15.5 - 16.0 PSI
Idle............. 14.0 - 14.5 PSI
Cruise 65 MPH 11.0 - 12.5 PSI
WOT............ 7.5 - 8.0 PSI
This is a stock pump. NOT a intank either...
#11
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Originally Posted by Geico266
Ya know, I just talked to a Cummins tech that says we are all wet about fuel pressure PSI. It's volume of fuel over PSI. He told me as long as I'm getting 50 oz's per 25 seconds I'm good to go. But I'm replacing it with a FASS II anyway. I just don't like the idea of pulling it down past 5 PSI WOT.
#12
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OK, it's getting worse. After less than 75 miles I can drag the WOT down to 6psi. This pump is only 4 days old and driven 2 days. Should I take it back? Pressure at idle and cruse are unchanged 16 idle and 12-14 cruse.
Bill.
Bill.
#15
Originally Posted by dminer
6 psi is getting close to your limit on the low side. The stock banjo's are the most restrictive part in my opinion.