I dunno that model (or relay) specifically, but I DO know that on another car we had, the relay had 2 "stages" one to prime the line before starting (or build pressure or whatever), and another to run the pump after ignition and the car was running. The prob we had (If I recall correctly) was that our car would crank and crank and not start, then it would start and run fine. Then the next time we tried it- it would crank and crank again. So if it was me, I might take a look at the relay as previously discussed.