The right way to do this is use pressure switch from 80's dodge truck , circuit closes at 5 psi oil pressure , w or w/o relay , then change lines so you do not pressurize stock pump. Add diode so it runs during crank once pressure in oil it stays on .Other contact in it can light red light , no oil pressure Pressurizing stock pump can be a big hazard , diaphragm failure (? way it fails)! rapidly pumps gas all over the place . Maybe cranking to get oil up is good, actually. Dry start is a very bad thing for cam and beatings. Push button is safe , I like that , but if going electric why not get rid of mechanical, hazard of pressure in it ? But need to do above thing Either pump alone is ok actually . So what if crank?! Push button is functionally good though , but restricting suction line with turned off pump in it not good all pumps hate suction restriction . And some will not pass gas if off . I use the Carter rotary ( a real fuel pump.. -- two versions , use low pressure) as full time pump on modified cars it is bulletproof But a bit loud . Last few cars mounted it by FI rated hoses ( tough ) clamped line to frame on standoffs 3" away from pump . ,all protected by frame near tank.Like a gas filter inserted into carb line supported by hose Stock Carter metal brackets not good despite lame attempt at rubber -- noise goes into frame ymmv On Sep 20, 2026, at 7:56 AM, John Nowosacki <jsnowosacki@xxxxxxxxx> wrote:
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