Gonna Set it on Fire
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New User
Joined: Nov 2007
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Gonna Set it on Fire
Okay, I just got done rebuilding the 302 EFI in my 86 F150. Everything was rebuilt back to stock, nothing aftermarket, and the truck started before I took the engine out. Now it won't start 
.
I have power going to the relay, the High pressure pump vibrates when the key is opened, but I get no vibration from the intank pumps, nor do I get a fuel level from the tanks. I didn't think the inertia switch a problem since I got power to the High Pressure Pump, but I checked to see if I was getting power there, and I got nothing at either wire, went ahead and pulled the tank select switch and I get no power to it either.
Will the High pressure pump come on even if there is no power, as far as I can tell, at either Inertia switch or tank selector switch?
Please Help, I'm about ready to set this thing on fire.
.I have power going to the relay, the High pressure pump vibrates when the key is opened, but I get no vibration from the intank pumps, nor do I get a fuel level from the tanks. I didn't think the inertia switch a problem since I got power to the High Pressure Pump, but I checked to see if I was getting power there, and I got nothing at either wire, went ahead and pulled the tank select switch and I get no power to it either.
Will the High pressure pump come on even if there is no power, as far as I can tell, at either Inertia switch or tank selector switch?
Please Help, I'm about ready to set this thing on fire.
Fleet Mechanic
Joined: Jul 2011
Posts: 1,916
Likes: 4
No use in setting the thing on fire. That'd be like burning your bank account, particularly after you just rebuilt the motor.
First, you need to get a multimeter and a copy of the wiring diagrams for your truck. Then you need to learn how to troubleshoot electrical problems and test for voltage and resistance.
Once you've done that, you can trace the lines with the multimeter and wiring diagrams and figure out why the fuel pumps ain't gettin' juice so they can start pumpin'.
Once you've got the power issue sorted out (sounds like bad/loose connections to me):
Then you need to verify that your motor is on TDC of the compression stroke for the #1 cylinder.
Then, turn the rotor to where it's pointing at the #1 spark tower on the distributor cap. Then, insert the distributor and make sure it's as close to the #1 plug as possible while at TDC of the #1 cylinder. This should get you fired off and running.
Also, check that the motor gets spark.
To get this thing you start, you need 4 basic things: compression, air, fuel, and fire.
Also, since it's fuel injected, you haven't missed anything when you put it all back together have you? Check all your plugs and electrical connections.
First, you need to get a multimeter and a copy of the wiring diagrams for your truck. Then you need to learn how to troubleshoot electrical problems and test for voltage and resistance.
Once you've done that, you can trace the lines with the multimeter and wiring diagrams and figure out why the fuel pumps ain't gettin' juice so they can start pumpin'.
Once you've got the power issue sorted out (sounds like bad/loose connections to me):
Then you need to verify that your motor is on TDC of the compression stroke for the #1 cylinder.
Then, turn the rotor to where it's pointing at the #1 spark tower on the distributor cap. Then, insert the distributor and make sure it's as close to the #1 plug as possible while at TDC of the #1 cylinder. This should get you fired off and running.
Also, check that the motor gets spark.
To get this thing you start, you need 4 basic things: compression, air, fuel, and fire.
Also, since it's fuel injected, you haven't missed anything when you put it all back together have you? Check all your plugs and electrical connections.
Posting Guru
Joined: Jan 2012
Posts: 1,410
Likes: 1
From: Dallas, GA
Not sure of your particulare wiring but on other dual tank, electric pump set ups, your pumps should get power from 2 sources. First off the starter relay when the key is in start and then from a sourse from the key when in run. The source in run will go through an oil pressure switch and relay so that your pumps only get power if you have oil pressure...this is a safety precaution that removes power to the pumps if the engine loses oil pressure.
Both sources then go through the tank selector switch and then to the in tank pumps.
This is a typical diagram for a 460 but should be similar, if not the same, as yours.
Both sources then go through the tank selector switch and then to the in tank pumps.
This is a typical diagram for a 460 but should be similar, if not the same, as yours.
Posting Guru
Joined: Jan 2012
Posts: 1,410
Likes: 1
From: Dallas, GA
you state you are also not getting tank level from either tank....to me this points toward something in this curcuit is wrong, loose or fuse. Like 1983F1503004X4 says....use a multi-meter and start checking. Check you fuse(s) for power and keep going back in the curcuit till you find you have no power and you'll find your problem.
Posting Guru
Joined: Jan 2012
Posts: 1,410
Likes: 1
From: Dallas, GA
If you get no fuel....then you know it's electrical. This may help you to get you going down the right path. Mechanical or electrical. But only if you play it very safe and are comfortable doint this. Don't need fuel spraying all over uncontrolled.
Posting Guru
Joined: Jun 2009
Posts: 1,509
Likes: 1
From: Wagener, SC
I personally would start by seeing if the pump(s) are working at all. Not sure how comfortable you are with it but I would try disconnecting the fuel line as close to the pump as possible and route a line to a portable gas can and have someone try to start the engine...see if anything comes out. If you get fuel then it's a filter or tranfer valve or something mechanical. You can even disconnect the lead going to the starter at the fender solenoid...that way going to start will not crank the engine.
If you get no fuel....then you know it's electrical. This may help you to get you going down the right path. Mechanical or electrical. But only if you play it very safe and are comfortable doint this. Don't need fuel spraying all over uncontrolled.
If you get no fuel....then you know it's electrical. This may help you to get you going down the right path. Mechanical or electrical. But only if you play it very safe and are comfortable doint this. Don't need fuel spraying all over uncontrolled.
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New User
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On my way over there right now, I'm gonna try all of the suggestions. Hope to find the issues today.
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Cargo Master
Joined: Apr 2010
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From: Acworth, GA
Just a curious question. You say the engine was just rebuilt, it starts with starting fluid, not getting gas to the carburetor. Is it a mechanical fuel pump or an electric one? If it's mechanical what about the fuel pump shaft, did someone forget to put it in? I'm only asking because I've seen it happen before.
Old School Hot Rodder
Joined: Feb 2006
Posts: 6,472
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From: Exmore, VA
Gonna Set it on Fire
I have the wiring for the 86 EFI system, your in-tank pumps are fed through the tank selector switch. If both in-tank pumps don't run and your fuel gauge doesn't work I would start there.
Fleet Mechanic
Joined: Jul 2011
Posts: 1,916
Likes: 4
Glad to hear, and thanks for following up on this and letting us know what the problem(s) was/is/were.
Let us know if you ever need anything else. Like you already know, we're a friendly bunch and glad to help.
Let us know if you ever need anything else. Like you already know, we're a friendly bunch and glad to help.
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