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Jmuirhead9
11-01-2016, 06:09 PM
Hi,

About to install an in-line fuel pressure gauge on my 4d55, but can't find any info on what proper PSI to be looking for.

Does anyone have info on this?

Cheers
frankwrench
11-08-2016, 08:15 PM
When you say "in-line", which line are you referring to? The pressure from the fuel pump to the injectors is going to be going to very different, and much higher than, the pressure between the tank and the fuel filter.
Jmuirhead9
11-17-2016, 11:17 PM
Placed it in between fuel filter and injection pump. Just seemed to make sense that it go there.
skullzaflare
11-18-2016, 06:31 PM
Placed it in between fuel filter and injection pump. Just seemed to make sense that it go there.
As far as i am aware, there is no needed lift pump, so if you dont have a lift pump it wont read anything. I have run my 4d56 with no left pump, injection pump only. I do have a little clicker pump though
drBob
12-04-2016, 12:34 PM
No need for a pressure gauge on the pump supply line, although the Bosch pump does require 5-7 psi. The injection pump will definitely benefit having a lift pump installed. The purpose of the primary internal transfer pump is to supply internal pressure to the injection pump and not to pull fuel from the tank. Transfer, lift, and supply pumps are designed to push not pull.
Jmuirhead9
12-12-2016, 05:33 PM
On the rangers there is a stock lift pump along the frame...So if there's no need for a gauge on the IP supply line, where would you put the gauge? I'm getting a reading of 3 PSI, which I saw someone else post on a forum this engine only requires 2-3 PSI...
drBob
12-25-2016, 05:16 PM
The test plan for the Bosch VE pump calls for 5-7 psi at the inlet port. The pump was NOT designed to pull fuel from the supply tank. The two causes of failure to the VE pump are water in the fuel and fuel starvation. You should still be OK with 3 psi but I would not go below 3psi.
Jmuirhead9
02-16-2017, 11:59 AM
So my mechanic took a look, and seemed to think that even with the lift pump running, since the IP is pulling more pressure than the lift pump is pushing it's reading 0...he seemed to think that it could be the wrong lift pump, but it's what lordco gave us, and same part # on rockauto....He seemed to think that it was fine anyways, but I'm a little skeptical. Thoughts?