Fuel pressure issues with new pump and regulator - Ford Powerstroke Diesel Forum
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Old 08-04-2014, 06:06 PM
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Fuel pressure issues with new pump and regulator

Short story:
I have a brand new 6.0 pump, used 6.4l pump inline with beans diesel sump and new blue spring regulator. The truck won't maintain pressure above 45psi when getting on the freeway or passing on hills at WOT.

Long Story:
So a couple weeks ago I noticed my fuel pressure was dropping down below 45psi quite often, so I decided to install a new pump, and while I was at it I installed a blue spring. The blue spring came first and gave it a nice bump at idle, and even got it to hold just over 45 psi most of the time, but not for hard acceleration. When I got my new pump it seemed to keep up around 48-50 psi in a hard uphill pull/heavy acceleration dropping from 68psi idle 65psi cruising.

I still thought that was a little close since I wasn't loaded with anything and wanted to maintain pressure a little better. I installed a 6.4L lift pump and beans diesel sump prior to the main pump. This worked great for the first couple days. Couldn't get it to drop below 60psi under any conditions and idle/cruising psi was same as it was before.

A couple days later (morning I was leaving to go to the coast for the weekend). I noticed it was only at 60psi when i started the truck, but as it warmed up it came back to 68psi. It made it to the coast dropping down to 50-55psi on some really steep hills while passing, but seemed ok. On the way back however I had to baby it to keep it over 45psi even though it was idling at 65 psi.

Today it wouldn't hold above 50 so I took out the pump and checked everything then re installed it. bumped up to 68psi and didn't drop below 60 again, and I thought my problem was solved. A couple hours later I'm having the same problem. Idle is 67-68psi, cruising is 61-62psi, WOT 40PSI?????????

Last edited by CJT2387; 08-04-2014 at 06:11 PM.
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Old 08-04-2014, 06:09 PM
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I disconnected the factory pump and left the 6.4 pump plugged in. It gets 18psi key on engine off. I thought this was a 10psi high volume pump? Am I wrong or is there something wrong with my 6.4 pump creating extra work for the 6.0 high pressure pump. Seems like everyone else that did this mod turned out fine and never had a drop more the 3-5psi...

I honestly do not know what injectors are in it. I bought it at 200k and it now has 230k. I did install head studs and egr delete.

It only has a 40hp atlas tune from when I had the FICM replaced.
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