2011 Sonata fuel issues
 

Greetings All,
Anyone know how to check the pressures on the high and low pressure fuel pumps. Trying to figure out which one in bad.
Mike

Need a capable scan tool.

If, however, the engine barely runs, there is a good chance the Hi press pump is defective. If it has no fuel pressure at all chances are low press pump.
Most engines will manage to run , barely, with just the low press pump.