electric fuel pump

Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=10935
Printed Date: May 28, 2024 at 9:48 PM

Topic: electric fuel pump

Posted By: justa
Subject: electric fuel pump
Date Posted: March 15, 2003 at 5:06 PM

i have a 87 dodge ramcharger V8 318 5.2L and the thing that pushes the fuel pump to pump gas is dull! so i bought a electric fuel pump. there are two wires (ground and hot), i know where to put the ground. the hot? i was told to hook it up to the ignition (something that powers on only when the key turns). i want to put it near the tank so heat won't vapor lock it. how do i run this wire and where do i run it to? sorry so new.

justa

Replies:

Posted By: auex
Date Posted: March 15, 2003 at 6:25 PM

Ok you first need to find your ignition wire(should be blue). This wire will test hot or +12V when the key is in the run position and will stay hot when the key is cranking. Then you shold solder a wire to the igntion wire and fuse it at what ever the fuel pump recommends. Then you need to get the wire out of the car, through the firewall would be best and make sure that is loomed. Then just run it to the place your are mounting your fuel pump securing it to the frame or anything that doesn't move too much and then just connect it to the fuel pump.

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Posted By: Two_Cold
Date Posted: March 15, 2003 at 6:35 PM

Justa

Is that truck fuel injected? Are you sure that pump will work? Have you talked to anyone about installing that type of fuel pump? Where is the existing fuel pump?

I am not sure about an '87 but most modern vehicles need a specific amount of fuel pressure. In older cars without fuel injection almost any fuel pump would work, but newer vehicles are alot less tolerant.

It is not a very good idea to just leave the broken old pump in the vehicle as it will restrict fuel flow and may cause your new pump to wear out early, or maybe not pump enough fuel.

If you are just doing a patch repair, then install it as close as possible to the existing fuel pump.

As far as the correct power source to use, you should use a relay and have the relay triggered by an ignition wire that is on when the key is turned on and stays on even when the starter is engaged.

Maybe someone here will have a wiring diagram for your truck so you can look up the correct wire color.

Posted By: speedwayaudio1
Date Posted: March 20, 2003 at 6:21 AM

it must be a carb motor to have a mech fuel pump. fix the mech pump. elect pumps have too much danger. in a roll over without a merc switch to kill the pump you will just feed the fire.

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Big Dave

Posted By: justa
Date Posted: March 21, 2003 at 3:54 PM

speedway your right but the new mech fuel pump i put in it doesn't work either. that rod that pumps it is dull so instead of breaking the Water Pump, Timing Chain, and all the stuff thats in front of it down i went with the Elec Pump. Auex your directions were very clear and simple but i'm a baby at this stuff, so i decided to do this. let me know what u think.

mount the Elec fuel pump. wire it to a switch which is connected to the (+) battery. (oh yeah and connect it through an in-line fuse.) its kinda like a kill switch. BAD PART. if i forget to turn that switch off it'll keep pumpin. so i got a switch with a blinking L.E.D. now i don't what i should wire to the LED part. what do u all think?