The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

gmclowsierra · 10-19-2015, 10:14 AM

You can get a Painless harness for the fuel pump. it uses the oil pressure switch to control the relay. you need ignition voltage in the switch to the control side of the relay. the power side of the relay goes to the battery to the pump. if you want a prime you would need to add a push button from battery to the power side of the relay. I ran a holley blue pump for years and never had a prime. the only time I had an issue with it is from sitting all winter long. all I did was crank the enginr till it got oil pressure and then the pump would fill the carb. after that it was good to go. you still need to run a regulator in the system to knock the fuel pressure down to about 5 pounds.

10-19-2015, 10:14 AM	#24
gmclowsierra Registered User Join Date: Mar 2008 Location: williamsport,pa Posts: 329	Re: 1978 2wd Blazer You can get a Painless harness for the fuel pump. it uses the oil pressure switch to control the relay. you need ignition voltage in the switch to the control side of the relay. the power side of the relay goes to the battery to the pump. if you want a prime you would need to add a push button from battery to the power side of the relay. I ran a holley blue pump for years and never had a prime. the only time I had an issue with it is from sitting all winter long. all I did was crank the enginr till it got oil pressure and then the pump would fill the carb. after that it was good to go. you still need to run a regulator in the system to knock the fuel pressure down to about 5 pounds.