did you get the problem fixed?
'84 E350 460 Fuel problem
Junior User
Joined: Jan 2003
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From: valencia pa.
It is behind the passenger kick plate. open the door,look under the dash at the top of the kick plate,and you should find it. there is a button on top of it with a plug end on it. depress the button and tape it in the down position ,or put a jumper wire in the plug end. Mush
Freshman User
Joined: Mar 2007
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From: Regina Sk Area
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
I'm having the "SAME" problems with my 85 E350 Motorhome. Did you get it fixed? If so what was the problem?
My posts are >>Here<< on my problems with the fuel.
My posts are >>Here<< on my problems with the fuel.
I do not think any of the posters over there know what they are talking about as far as your MH.
That is not a fuel pressure regulator, it is a hot gas bypass.
The Oil pressure switch turns off the fuel pumps not the ignition.
And it goes on and on.
Have you read through this link?
Thread Starter
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Junior User
Joined: Oct 2008
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I know both tank pumps are running and delivering good fuel to start while cranking. The pumps do not run when not cranking. I have tried shorting the oil pressure switch terminals - no luck, but maybe it wasn't making contact. The oil pressure switch fuse is good - I have 12v there with the key on. I wonder if the relay operated by the oil pressure switch is bad (I see this on the wiring diagram). Where is this relay located? I wouldn't think the inertia switch would be bad - nothing has happened to open this.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
I know both tank pumps are running and delivering good fuel to start while cranking. The pumps do not run when not cranking. I have tried shorting the oil pressure switch terminals - no luck, but maybe it wasn't making contact. The oil pressure switch fuse is good - I have 12v there with the key on. I wonder if the relay operated by the oil pressure switch is bad (I see this on the wiring diagram). Where is this relay located? I wouldn't think the inertia switch would be bad - nothing has happened to open this.
The location of the relay from my only information is "LH corner of dash panel".
Freshman User
Joined: Mar 2007
Posts: 31
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From: Regina Sk Area
There is so much bad information in that link I would not know where to start.
I do not think any of the posters over there know what they are talking about as far as your MH.
That is not a fuel pressure regulator, it is a hot gas bypass.
The Oil pressure switch turns off the fuel pumps not the ignition.
And it goes on and on.
Have you read through this link?
I do not think any of the posters over there know what they are talking about as far as your MH.
That is not a fuel pressure regulator, it is a hot gas bypass.
The Oil pressure switch turns off the fuel pumps not the ignition.
And it goes on and on.
Have you read through this link?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
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Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
You do not have a fuel relay or a cut off switch on your 85.
Junior User
Joined: Dec 2010
Posts: 77
Likes: 0
From: rapid city, sd
No they do not run when you just turn on the key.
That is normal
Unless you know the pumps are running how do you know how much pressure you have?
You would have to put power (jumper power to) on the wire (PK/BK) coming from the starter relay (solenoid) to test the pressure.
No, they will operate when the engine is cranking or if the key is on AND you have oil pressure.
Yes they should be available from a parts house like NAPA.
But it is unlikely that both fuel pumps are bad.
There is a bypass circuit that bypass the oil switch while cranking that is operated by the starter solenoid.
I think these fuel pumps are the same as the fuel pumps used in the 1986-1989 in-tank pumps on the FI trucks and vans. I took a fuel tank from a 1997 FI van and put the tank, pump and all in my 1992 E350 with a 4V Carb. and have been running it that way for 10 years with no problems.
I think they put out between 6-8 PSI as that is what the 4V Carb wants.
Here is a electrical diagram of the fuel system:
/
That is normal
Unless you know the pumps are running how do you know how much pressure you have?
You would have to put power (jumper power to) on the wire (PK/BK) coming from the starter relay (solenoid) to test the pressure.
No, they will operate when the engine is cranking or if the key is on AND you have oil pressure.
Yes they should be available from a parts house like NAPA.
But it is unlikely that both fuel pumps are bad.
There is a bypass circuit that bypass the oil switch while cranking that is operated by the starter solenoid.
I think these fuel pumps are the same as the fuel pumps used in the 1986-1989 in-tank pumps on the FI trucks and vans. I took a fuel tank from a 1997 FI van and put the tank, pump and all in my 1992 E350 with a 4V Carb. and have been running it that way for 10 years with no problems.
I think they put out between 6-8 PSI as that is what the 4V Carb wants.
Here is a electrical diagram of the fuel system:
/
New User
Joined: Jul 2010
Posts: 9
Likes: 0
Thanks
I found the problem a ping pong sized ball was in the gas neck where you put the gas in. It seems to be there because of backwash. It was varnish stuck closing off the fuel tank. The tank appeared to be filled to the top at the gas cap but it was not making it into the tank. Truck started beautifully after that. What a pain in the ***.