GAS NOT GETTING TO HIGH PRESSURE FUEL PUMP OR BLACK CAN

1988 FORD F-250
180,000 MILES • 5.8L • V8 • 4WD • AUTOMATIC
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RUDDBIGDOG
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OUR FARM TRUCK SHUT OFF ABOUT A YEAR AGO. ITS BEEN SETTING UP. I CALLED 2 DIFFERENT COMPANIES MATCHED COMPUTER UP. SO I REPLACED COMPUTER BRAND NEW ONE. I DONE TRIED ALL DIFFERENT FUEL RELAY SWITCHES. DONE CHECKED SAFE CUT OFF SWITCH BUTTON IS DOWN. I DID PUT A TEST LIGHT ON THE 2 WIRES THAT GO TO IT NO POWER ON EITHER ONE OF THE 2. REPLACE FILTER AND HIGH PRESSURE PUMP EXTERNAL ONE. REPLACE BLACK CANISTER LOOKIN THINK ALSO. I HAVE DUAL TANKS WHICH BOTH WAS WORKING FINE WHEN WE WAS USING THE TRUCK. I SWITCH FORM BOTH TANKS BACK AND FORTH BUT STILL NOTHING. I NARROW FUEL DOWN TO EITHER MY 2 INTERNAL PUMPS IS GONE OUT . OR THERE IS NO POWER TO THE 2 PUMPS IN THE TANKS. WITH A NEW COMPUTER , NEW RELAY , NEW BATTERY, NEW PRESSURE SWITCH, NEW HIGH PRESSURE PUMP, NEW FILTERS AND THE SAFETY SWITCH PUSH DOWN WHY IS THERE NO POWER TO MY 2 PUMPS IN THE TANKS ? THERE IS POWER AND IT DO RUN TO THE OUTSIDE PUMP. IS THERE A DIFFERENT FUSE FOR THE PUMPS IN THE TANKS. THANKS FOR THE HELP IN ADVANCE. I AM GETTING WHIPPED BY THIS FORD. PLEASE HELP
Apr 20, 2016 at 2:59 AM
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RUDDBIGDOG
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I FORGOT TO SAY I DID DRAIN ALL OLD GAS OUT AND PUT NEW GSA IN BOTH TANKS AND DRAINED OUT ONCE MORE AND PUT ABOUT 5 GALS OF NEW GAS IN BOTH TANKS. THANKS
Apr 20, 2016 at 3:10 AM
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HMAC300
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you have to find the reason to no power to inertia switch as you said you don't have power on either side. check the fusible links at starter relay they should have power on both sides. they are available at auto parts if bad. MUST BE SAME SIZE WIRE. then check fuel pump relay for putting power out. see pics.
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Apr 20, 2016 at 6:45 AM
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RUDDBIGDOG
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Ok thanks . What is the starter relay you talking about. I have a hot wire with like a 20 or 30 amp fuse coming from my solenoid over by the battery it's hot . Also with my truck switched on I checked my wires coming out my green fuel relay like 5 wires all of them is hot except 1 black wire it's not hot. I only have 2 relays bolted on air filter the green fuel relay then a brown one don't know what it is . Thanks
Apr 20, 2016 at 6:59 AM
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HMAC300
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the starter relay is on the fender where the battery connects to. check all the wires on both ends in pic i sent if one is getting power on one end and not the other it's a fusible link that has burnt up and needs to be replaced.the one wire that you are talking about may be going to the ignition switch lead which is yellow which supplies power to the fuel pump relay so it won't send power to your pump to work...
Apr 20, 2016 at 7:24 AM
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RUDDBIGDOG
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Where would the fuse be ? Under dash with all the rest . That is the only fuses I see . None is blown . The other fuse is the wire I telling u about that is got a fuse in it coming off the thing u talking about. But all wires is hot coming off the green relay except the black wire . Thanks
Apr 20, 2016 at 7:52 AM
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RUDDBIGDOG
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Is there anyway they gave me the wrong computer and it's not letting the 2 pumps in the tanks come on. Which I called the company that make computer they matched and then the part store matched up same thing. Thanks
Apr 20, 2016 at 7:58 AM
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HMAC300
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i don't think you understand what i 'm talking about. it is a fusible link not a fuse with the info i've given you you should be able to tell if there is power to the fuel pump relay with a tester or voltmeter which i've also shown a pic of it's location. you keep talking about a black wire which connects to the yellow wire by the relay. it is in the second pic that i sent to you if you don't know where these items are then i highly suggest you have someone that knows a car better than you point these items out. from what you are describing initially i suspect the relay isn't getting power which hasn't much at all to do with the computer. the relay is on fender well and should look similar to picture shown. the fusible links go off of that and test those wires i have pointed out in previous pics. pic will come in next email
Apr 20, 2016 at 12:05 PM
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HMAC300
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relay pic
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Apr 20, 2016 at 12:06 PM
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RUDDBIGDOG
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I have power ever where you talking about . Also to and from my inerita switch is power. . I can not get to wires at tank to check them . So I don't know if it's power at tank but every where else seems to have power . Could both pumps in gas tank went out the same time .
Apr 20, 2016 at 3:00 PM
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RUDDBIGDOG
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Do u know how many wires go to each tank and also the color. I have a bundle of wire going down the Frame come off that way. I won't know until I have to pull tank down or off.
Apr 20, 2016 at 3:15 PM
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HMAC300
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see this in pic it should take care of it. before you said you had no power through inertia switch.
the arrow indicate the hot wires going to fuel pump or which ones should have power. I have no further comments on this matter
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Apr 20, 2016 at 3:34 PM
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RUDDBIGDOG
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I was not lying to you about the power to the switch. I did little more research and seen it only stay on a fee seconds .so it stayed on for few seconds and then off. Thanks for your valuable time. I am no mechanic but I do try anything .
Apr 20, 2016 at 4:34 PM
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RUDDBIGDOG
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Can some read this help me out ? Thanks in advance . I got to check the wires going to my tanks today. It's 2 solid red wires and 2 more one look solid black and one has stripes on it . Wiped off but still to faded to tell. The 1 red wire comes on for a few seconds like suppose to. The stripe wire stays hot the whole time .the black wire must be ground not sure but not hot and the other red wire no power on it either. So do both red wires suppose to be hot. Or could my pumps in tank be bad . Thanks
Apr 23, 2016 at 4:12 PM
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HMAC300
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I sent every thing you needed and pointed out he wires that go to it. we can help no further we can't test this stuff over the computer.
Apr 23, 2016 at 4:30 PM