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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 07-04-2010, 10:49 AM
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how to drain fuel?

ok guys i swapped the engine from my 90 f250 into my 89 f250... both 351's... one is a zf trans.. the other was a E4OD... got it hooked up yesterday, tried to crank it... it sputted for a secong and now nothing,, i think the gas in the truck is not good enough to run... i was wondering if there was a easy way to disconnect the fuel line and jump something so the pump will run and i can drain all the old gas... so my question is is there a relay i can jump to make it run continiously until i undo the jump on it?? also would it have any troubles running the 90 engine off the 89 computer??

also i am going to rent a fuel pressure tester now so i can test my pressure also.... also gonna check for spark (even tho i dont see that being an issue beings that it ran in the other truck... just looking for a few ideas so when i get back i can hopefully get this thing to fire up today
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Old 07-04-2010, 11:10 AM
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There is a drain plug on the bottom...just unscrew it.
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Old 07-04-2010, 12:19 PM
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Unplug the electrical plug on the high pressure pump.
Unhook the pressure fuel lines from each tank where they go into the fuel selector valve by pulling out the hair pin clip and then pulling the hose off and sticking the hoses into 5 gal buckets.
Jump pin #2 to pin #6 of the self-test plug, select the tank to pump from and turn on the key.

I have never seen a drain plug on a fuel tank.
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Old 07-04-2010, 12:46 PM
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neither have i seen a drain plug on a fuel tank.... thanks subford.... i gotta play a little bit first and see if i can get a pressure reading.... by the way where is the inertia switch and fuel pump relays on these anyways??
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1997 Ranger 2wd 4.0L 5 speed ( SOLD )
1990 F250 4wd 5.8L E4OD trans ( Death by rust.. killed before it lived )
1989 F250 4WD 5.8L ZF5 ( Sold.... I miss it already )
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Old 07-04-2010, 12:55 PM
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Inertia Switch:
Click the image to open in full size.

EEC & Fuel Pump relays:
Click the image to open in full size.

/
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Old 07-04-2010, 10:33 PM
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yeah the relay i seen as soon as i looked and thought about it for 2 seconds lol.. thanks tho, i didnt know where the inertia switch was, even tho in my case it wasnt the issue... the fuel tank selector valve was shot and not letting any fuel through whatsoever.. didnt think it could completely clog up, but it managed to... anyways pulled it out and just jumped the lines for the rear tank. now with its new engine, clutch, and rigged fuel lines it actually runs now,,, now i just got a hundred other things to work out, dont worry you all will be hearing from me soon enough about help on other issues lol
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[2002 F150 4wd 4.2L 5 speed (Daily Driver)
1997 Ranger 2wd 4.0L 5 speed ( SOLD )
1990 F250 4wd 5.8L E4OD trans ( Death by rust.. killed before it lived )
1989 F250 4WD 5.8L ZF5 ( Sold.... I miss it already )
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Old 07-04-2010, 10:54 PM
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Old 07-04-2010, 10:54 PM
 
 
 
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