Have since upgraded the lift pump to a Carter HP4601 (old one still good just wanted to run a higher pressure) so the fuel pressure I'm seeing now is 11psi at idle after it internally regulates then it 100k cruise at 10.2psi dropping to 8.5psi wot, have been running this pump for around 1 year now and all is great.
No it doesn't dead head and it doesn't need a return line, I fully researched this years ago when I was working in the States where these were a popular and economical addition and even std fitment on some model Dodges. The Carter has internal regulation that takes care of that, I've been running Carters for years without incident, indeed I'm pushing up to 13psi at the moment with an upgrade.
you have the quietest cummings diesel ever how did you manage that? never met an internally regulated pump that did not burn itself up prematurely. even the holley fuel pumps need a return otherwise they last about a years worth of time just like the carters. but your system looks as if it is working pretty good with steady pressure.
Not a Cummins, Nissan. Yes the Carter does handle it well, I had looked at many pumps including Faust when I ws in the US but they are expensive and definitely need a pressure relief valve and return line, I do have a bypass to allow the VP44 to suck diesel through a non return line before the Carter in the event of a failure, but in the years I've been running it I've had no need. I also looked at solenoid pumps that don't require anything but the volumes were to low and you still went into negative territory by 2500rpm.
some good feedback there.Even carrying around 1 psi of positive pressure a@3500RPM is still better than Vac. Hey I think I remember your drop in fuel pressure @16,000 kms. You were mixed up in a thunderstorm of subtank capacities discussion with some intelligent young lad :)
Hi Pete, have tried everything I know but I don't seem to be able to reply to your comment, I can give you a link to my Lift Pump install thread if I can reply, the link will not paste into this general comment pane for some reason.
+Geeyoutoo OK now that I have posted my comment, it seems I can post the link??????? www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/lift-pump-install-yes-yes-another-one-79597/ the actual install starts around post 56 but there is good base info in the earlier bits where I was gathering info to make decisions I thought best for my circumstances. You should be able to view pics.
Have since upgraded the lift pump to a Carter HP4601 (old one still good just wanted to run a higher pressure) so the fuel pressure I'm seeing now is 11psi at idle after it internally regulates then it 100k cruise at 10.2psi dropping to 8.5psi wot, have been running this pump for around 1 year now and all is great.
the fuel dead heads it needs a return line with a restriction to make the pump last longer and stop the pressure spiking during operation.
No it doesn't dead head and it doesn't need a return line, I fully researched this years ago when I was working in the States where these were a popular and economical addition and even std fitment on some model Dodges. The Carter has internal regulation that takes care of that, I've been running Carters for years without incident, indeed I'm pushing up to 13psi at the moment with an upgrade.
you have the quietest cummings diesel ever how did you manage that? never met an internally regulated pump that did not burn itself up prematurely. even the holley fuel pumps need a return otherwise they last about a years worth of time just like the carters. but your system looks as if it is working pretty good with steady pressure.
Not a Cummins, Nissan. Yes the Carter does handle it well, I had looked at many pumps including Faust when I ws in the US but they are expensive and definitely need a pressure relief valve and return line, I do have a bypass to allow the VP44 to suck diesel through a non return line before the Carter in the event of a failure, but in the years I've been running it I've had no need. I also looked at solenoid pumps that don't require anything but the volumes were to low and you still went into negative territory by 2500rpm.
some good feedback there.Even carrying around 1 psi of positive pressure a@3500RPM is still better than Vac.
Hey I think I remember your drop in fuel pressure @16,000 kms. You were mixed up in a thunderstorm of subtank capacities discussion with some intelligent young lad :)
Shan Murray Yes I do seem to remember that conversation, turned into a zephyr in a thimble :).
Hi Pete, have tried everything I know but I don't seem to be able to reply to your comment, I can give you a link to my Lift Pump install thread if I can reply, the link will not paste into this general comment pane for some reason.
+Geeyoutoo
OK now that I have posted my comment, it seems I can post the link??????? www.patrol4x4.com/forum/nissan-patrol-gu-gr-10/lift-pump-install-yes-yes-another-one-79597/ the actual install starts around post 56 but there is good base info in the earlier bits where I was gathering info to make decisions I thought best for my circumstances. You should be able to view pics.
Hi just wondering how you plumbed your lift pump up, would like to try this mod myself thanks Pete
It's a bit daunting but not that hard once you understand it.