snacob14 Posted February 20, 2011 Share Posted February 20, 2011 will an 87 4.0 gas tank work in my 91 4.0? I think my sending unit is bad and I have a line on a whole setup pretty cheap Link to comment Share on other sites More sharing options...
jimoshel Posted February 20, 2011 Share Posted February 20, 2011 Yes Link to comment Share on other sites More sharing options...
mvusse Posted February 20, 2011 Share Posted February 20, 2011 The tank will work, but the sending unit will read somewhere around empty when the tank is full and move toward full as the tank empties. Link to comment Share on other sites More sharing options...
snacob14 Posted February 20, 2011 Author Share Posted February 20, 2011 i'm sorry i meant i think my pump is bad. nothing to the rail unless i turn the key back and forth a few times Link to comment Share on other sites More sharing options...
jimoshel Posted February 20, 2011 Share Posted February 20, 2011 Might not be the fuel pump. Could be the switch. Could be the relay. Would suggest you test them first before spending money. Link to comment Share on other sites More sharing options...
snacob14 Posted February 21, 2011 Author Share Posted February 21, 2011 where is the switch. the relay is clicking when i turn the truck on Link to comment Share on other sites More sharing options...
jimoshel Posted February 21, 2011 Share Posted February 21, 2011 The switch is at the bottom of the steering column.. There are various ways to test the circuit. Not knowing what you have in the way of test equipment I an going to assume you have very little. Remove the gas line from the rail. get a coffee can, or suitable container, to catch the gas in. Needless to say NO SMOKING. Now run a wire from the battery pos terminal to the ballast resistor. is gas coming out? If yes then the pump is good. If not then run the wire to the other post on the resistor. If there is now gas flow then the pump is good and the resistor is bad. The resistor is out of the circuit when the ign key is in START position. Remove the fuel pump relay. Insert the hot wire in the load side of the relay socket. There should be fuel flow. Replace the relay. Ign sw on. there should be fuel flow. If not then switch the fuel pump relay with one from either side of it. Now if you have flow then the relay is bad. If there is still no flow then the switch is bad, or just mis adjusted. And don't over look the fuse s. Th e relay may be clicking but the contacts are bad. If the relay is clicking then the switch is good. Sounds to me like either the resistor or the pump. Link to comment Share on other sites More sharing options...
snacob14 Posted February 21, 2011 Author Share Posted February 21, 2011 ok, i'll test those tomorrow morning. the switch is at the bottom of the column in the cab? Link to comment Share on other sites More sharing options...
jimoshel Posted February 21, 2011 Share Posted February 21, 2011 Yes. About 4 inches up from the floor board. Link to comment Share on other sites More sharing options...
snacob14 Posted February 22, 2011 Author Share Posted February 22, 2011 got a new fuel pump and we're good to go, thanks for all the help Link to comment Share on other sites More sharing options...
snacob14 Posted February 24, 2011 Author Share Posted February 24, 2011 replaced the pump but now i have a leak at the filter. it made pressure on initial start attempt. then nothing. feels like theres a clog at the filter but didnt have time to check Link to comment Share on other sites More sharing options...
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