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Epica Fuel Pump Issue

My 2007 Chevrolet Epica diesel with 226939 km is having issues. I think the fuel pump is bad because the engine doesn't start reliably and stalls at idle. It also runs rough, fuel consumption is up, and the check engine light is on. I scanned for codes but haven't found the exact one yet. I checked fuel lines. Could a bad cable or plug cause this?

A 2007 Chevrolet Epica diesel was experiencing unreliable starting, stalling at idle, rough running, increased fuel consumption, and an illuminated check engine light, suggesting a potential fuel pump issue. Possible causes included a faulty fuel pump, relay, wiring, or a clogged fuel filter. Suggested solutions involved checking the fuel pump relay, wiring connections, and fuel pressure, with a recommendation to consult a mechanic if these checks did not resolve the issue. Ultimately, a mechanic confirmed a fuel pump problem, and after repair, the car ran smoothly.

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4 comment(s)

Those symptoms point to a fuel delivery issue, and the fuel pump is a suspect. The error code would help. Did you read it with an OBD2 scanner? Good you checked the lines. Before replacing the pump, check the fuel pump relay and wiring. A loose connection could cause this. Also, check the fuel filter; a clogged filter can strain the pump.

I haven't checked fuel pressure at the rail. How hard is that, and what readings should I look for? Also, where is the fuel pump relay and how do I test it? I'll get the error code now.

For fuel pressure, you need a gauge connected to the Schrader valve on the fuel rail. The pressure spec is in your manual, but it's usually 40-60 PSI. Low pressure supports a fuel pump issue. The relay is often in the under-hood fuse box. Check your manual. Swap it with an identical relay (horn, etc.) to see if the problem goes away, or use a multimeter to check for continuity and voltage. Given the symptoms, if the relay and filter are okay, take it to a workshop before you cause more damage.

Thanks for the advice. I didn't do all the tests, but your insights pointed to a defective cable or plug connection. My mechanic confirmed the fuel pump issue. The repair was 95€, and the car runs smoothly now. Your guidance helped a lot.

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CHEVROLET

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EPICA