Assuming that you are using the correct replacement pump(s), then a re-check of the pump power and ground circuits may be in order. Does the car run OK when it's relatively cool outside and then exhibit problems later in the day or after you have warmed it up well under the hood?Īgain, the pump will only run for a short period if it is being tested on the car without the engine running. Does this problem seem to be temperature related? By temperature, I mean either ambient outside temp or temperature under the hood of the car. Something to think about.Īnyway, back to your issue. Some of these systems may have been tied into the fuel pump circuit. Sometimes those things can cause havoc if they were disabled or malfunctioning. Just curious if this car might have an add on (or factory) anti-theft system. Again - first look for any computer codes and report them and we can go from there.Good Luck If you have the means to perform a running fuel pressure test, then that may shed some light as well. Lastly, how about the fuel pickup screen on the bottom of the fuel pump assembly or the condition of the fuel tank (dirty?) - and how about the fuel filter (if it has one), has it been changed as well? Since you replaced the relay, don't assume that the relay or it's connections in the box are good, maybe they are flaky. If you are bench testing, then the pump should run continuously.Īssuming everything else is OK, check the pump ground circuit. If you were testing the pump on the car, then it will run for a short period when you first turn the key on, then it will shut off (if the engine isn't being started). Second, IIRC, the pump will run unless the computer sees a dropout of either the camshaft or crankshaft position sensor input while the engine is running. First, have you scanned the car's computer for stored or pending trouble codes? If so, then report them. I'm working off of memory here, so bear with me.
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