Fuel Pump Issue
#1
Junior Member
Thread Starter
Fuel Pump Issue
Hello, I have read several dozen threads on the subject of fuel pump, but nothing that has helped yet, so thought I would tap into the community.
1991 RX-7 NA
I just rebuilt the engine to include replacing every vacuum hose. I pulled the fuel tank and cleaned it out, replaced the strainer, and bench tested the fuel pump, but the pump isn't getting any power.
Here are all the troubleshooting steps I have done:
- Placed a jumper in the yellow connector
- Tested the fuel pump relay/resister (Tested good)
- Tested the circuit opening relay voltage with and without the jumper (Tested good)
- Tested the circuit opening relay for continuity (Tested good)
**Update**
- Tested the fuel pressure using the external 12V power supply. Pump holds roughly 55-60 psi at the fuel pump unit
Here is where it gets interesting... I connected a 12V power source to the pump and the system pressurizes, and the engine will crank, but will not stay running.
Any ideas?
1991 RX-7 NA
I just rebuilt the engine to include replacing every vacuum hose. I pulled the fuel tank and cleaned it out, replaced the strainer, and bench tested the fuel pump, but the pump isn't getting any power.
Here are all the troubleshooting steps I have done:
- Placed a jumper in the yellow connector
- Tested the fuel pump relay/resister (Tested good)
- Tested the circuit opening relay voltage with and without the jumper (Tested good)
- Tested the circuit opening relay for continuity (Tested good)
**Update**
- Tested the fuel pressure using the external 12V power supply. Pump holds roughly 55-60 psi at the fuel pump unit
Here is where it gets interesting... I connected a 12V power source to the pump and the system pressurizes, and the engine will crank, but will not stay running.
Any ideas?
Last edited by alton.carroll; 12-22-22 at 05:30 PM. Reason: Additional Information
The following users liked this post:
DR_Knight (12-24-22)
#4
Junior Member
Thread Starter
diabolical1, that did the trick. Its cranked right up and idles pretty high, but now I can start setting the crank angle
Does that mean that the MAF sensor if bad?
Does that mean that the MAF sensor if bad?
The following users liked this post:
alton.carroll (12-24-22)
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