Greetings all,

I experienced the dreaded P0087 Low fuel pressure fault while driving home from work. Cost me $450 to get my car towed home from Md to Va.....

I found the TSB about replacing the high pressure fuel pump and purchased one from Rock Auto and installed it. installation wasn't too bad and it looked like I would be on the road again.

My scan tool previously told me that the old high pressure fuel pump was only making 35 Psi. I cleared the codes and started the car and checked the fuel pressure on my code scanner....It showed 500-800 Psi! Now I know this couldn't be correct or my injectors would have surely been launched into orbit. Car seemed to drive fine, then the P0087 code popped again after 10 minutes and the code reader showed fuel pressure was only 45 Psi and put the car back into Limp Home mode. Cleared the code and it was again showing 500-800 Psi for the fuel pressure. Drove the car around the block for 15 minutes and the P0087 showed up again, 45Psi fuel pressure. I am not sure what is going on with this new fuel pump. Does the Honda Computer need to relearn a sensor after a code reset? if so, that would explain the crazy pressure reading and then allow the real one to show up (45Psi) which would tell me the new high pressure pump is junk and I need to get a warranty replacement sent.

Any help would be appreciated. This car has been super reliable and I need to get it back on the road so I can go back to work.

 

search for SB-10056640-1320.pdf . This is a tsb on installing the high pressure fuel pump and some things to check and how to properly install.

I don't have the exact specs for the pressure, but see ranges from 500 to 3000 psi for the high pressure pump on GDI engines. So that 500-800 psi is not high and could be low.

 

Update on the situation:

I found the TSB that was cited and had followed it but it did not lead me to a fix. The date on the TSB is October 14, 2014. Apparently there was a spate of bad pumps and no one was looking at anything else at the time because the rest of the car was brand new.

The fix was the in tank pump went weak. There are no sensors on the low pressure (57-60 PSi) side of the fuel system. There also is no test port on the low side to to hook up a Fuel Pressure gauge. The Haynes manual suggests hooking up a T adapter that has a male quick disconnect, a female quick disconnect, and a Schrader valve on it into the quick disconnect joint in the fuel line on the firewall of the car to measure the fuel pressure coming from the pump in the tank. The Haynes manual also fails to suggest where to get one. Best I could do was try and put one together from a Tee made for Nitrous that goes into a quick disconnect joint in you fuel line. Between that and a screw in Schrader valve, it was going to be $120 in parts. A used in tank fuel pump from a recycled parts house cost me $55 and fixed the problem.

Morale of the story is this: Technical Service Bulletins are great, but you need to look at the context to them. This one was in response to a problem when the car was brand new and hadn't been out in real world use for awhile.

EDIT: PAhonda was correct about the fuel system pressure. After the high Pressure fuel pump, rail pressure is anywhere between 500-3000 PSi when in use.