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1984 Ford E350 Fuel Problem 460

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Old 09-13-2011, 11:09 AM
Kingfish9 Kingfish9 is offline
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1984 Ford E350 Fuel Problem 460

This is a 460 w/Holley 4B carb. Duel Tanks. Fuel lines go from carb directly back to tank selector on rail behind driver side and then to each tank. I see no mechanical fuel pump. Checked Inertia Switch-power is working. Vehicle has been sitting but i have been starting every week. I am not hearing any energizing of pumps when the ignition is on or cranking. I cannot find any fuse box under hood, only under dash. All fuses under dash check out good. Replaced both Fuel Relays[Power up (EEC) and Fuel Relay(green) on driver side fender under hood. Tank selector switch under dash panel indicates fuel in both tanks(it moves when the toggle switch is changed from tank #1 to #2).There is one small 3Amp fuse at the bottom right of the fuse panel that does not have any power even with a new fuse, key on or off. I'm not sure what that fuse is for. I checked all the tank selector wires where they plug into selector, with the ignition key on, and no power is indicated with the testlight on any of the contacts that plug into the selector. No power to tank selector wires during cranking either. Is there a 5 pin Fuel Tank Select Relay ? If so, where is it located ? Both tanks have fuel. Any suggestions ?
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Old 09-13-2011, 08:54 PM
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subford subford is offline
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For testing the system you need to jumper out the oil pressure switch at the back top center of the engine. Then turn on the key and you can check every thing without cranking the engine.
You need to do all of the power testing with a test light and not a meter.

Here is a wiring diagram:
Click the image to open in full size.

/
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Old 09-13-2011, 10:06 PM
Kingfish9 Kingfish9 is offline
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Quote:
Originally Posted by subford View Post
For testing the system you need to jumper out the oil pressure switch at the back top center of the engine. Then turn on the key and you can check every thing without cranking the engine.
You need to do all of the power testing with a test light and not a meter.

Here is a wiring diagram:
Click the image to open in full size.

/
Thanks Bill. Can you give me a walk-thru on the testing? How do I "jumper out" the oil pressure switch ? Give me some details on checking out everything with the testlight. I need some step by step help as the electrical troubleshooting is a bit of a mystery to me.
Order of testing would be helpful too.
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Old 09-14-2011, 06:48 AM
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You have no EEC relay. Only the 5 pin Fuel Tank Select Relay and the Fuel pump cut-off relay.

To jump the oil pressure switch do it as in the photo below.
First you need to locate all of the items in the diagram above.
Most are in the photos below.

Maybe it would be better if you emailed me your email address and better yet if you would email me your phone number and when to call you.
My email address is at the bottom of this post.

Oil pressure switch jumped:
Click the image to open in full size.

Tank selector valve/relay:
Click the image to open in full size.

Fuel system diagram:
Click the image to open in full size.

The relays:
Click the image to open in full size.

/
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95 F150 302 4R70W EB EX-CAB
94 F53 460 E4OD COACHMEN SANTARA RV
93 F250 STYLESIDE 460 E4OD 4X4
77 F250 351M-2V NP 435/4 Speed 4X4
subford@gmail.com
Bill K, Kansas Chapter
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Old 04-01-2012, 11:34 PM
xbjbx xbjbx is offline
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Well, thought I had posted a reply .. but nothing here.

So, thanks for the info again!

Now, how is all of these effected with an auxiliary battery ... (and a generator )?

Jeff
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Old 04-02-2012, 08:32 AM
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Quote:
Originally Posted by xbjbx View Post
Now, how is all of these effected with an auxiliary battery ... (and a generator )?
The auxiliary battery and the generator are for use with the coach and not the chassis.
The engine charging system does charge the coach battery but not the other way around.
Some do have an jump switch that you can push if the chassis battery is down to get your engine started.
The auxiliary battery and the generator have nothing to do with the fuel system.
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95 F150 302 4R70W EB EX-CAB
94 F53 460 E4OD COACHMEN SANTARA RV
93 F250 STYLESIDE 460 E4OD 4X4
77 F250 351M-2V NP 435/4 Speed 4X4
subford@gmail.com
Bill K, Kansas Chapter
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