2007 Toyota Yaris popping a running lean error code. Long term fuel trim at 21% idle, 34% at 2500rpm. No difference between hot and cold engine. MAF at 2g/s idle, 6g/s at 2500RPM. No changes to numbers or behavior after cleaning the MAF and replacing the intake manifold gasket and brake booster hose. No difference after a can of Red Line fuel system cleaner. The fuel line doesn't have a Schrader valve so to check fuel pressure I'd need not only a fuel pressure gauge but also the Toyota/Denso connectors and I'm not real sure how to tell whether a particular kit has all that, or whether a particular set of Denso connectors bought separately would be compatible with a particular fuel gauge.
Should I just bite the bullet and replace the fuel pump without trying to check the fuel delivery pressure?