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Old 06-04-2018, 04:27 PM   #1
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Hello 👋 👋👋

Hi everyone. My name is Chuck and I basically just inherited a 1985 jamboree that's been sitting for some years. I've been wrenching on it for a couple weeks, getting it ready to start living in it.

I'm having to go through and fix a lot of "work" someone else did a few years ago trying to get it to run again. I'm at the stage where I'm finally ready to fix the actual problem that stopped it running in the first place.

There's a fuel delivery issue. It has an external in-line fuel pump mounted behind the gas tank that was replaced.
The guy who replaced it says he was told there is no in-tank fuel pump. Which didn't make any sense to me. But, since I don't really have any place to tell the dude he's wrong, I was wondering if I could find someone who knows these things pretty well here.

Thanks in advance for any help!
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Old 06-04-2018, 07:41 PM   #2
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Glad to have you here in the forum with us. You're gonna like it here.

I'm sorry, but I can't help you with that specific problem.

Happy Trails!!!
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Old 06-04-2018, 07:49 PM   #3
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Quote:
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Glad to have you here in the forum with us. You're gonna like it here.

I'm sorry, but I can't help you with that specific problem.

Happy Trails!!!
That's alright! Thanks for welcoming me in! I haven't participated in a forum in a few years. But definitely like how they become communities!
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Old 06-04-2018, 07:57 PM   #4
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What engine do you have?
Most engines by 1985 did have electric fuel pumps. Even if the factory fuel pump is in the tank, an inline after market fuel pump will usually pull fuel through it. It must be mounted as close to the tank as feasibly possible.
If by chance it has mechanical pump look at the lower passenger side of your engine (towards the front of the engine) Chevy, Ford, and Dodge V8 engines will have it there.
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Old 06-04-2018, 08:23 PM   #5
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Its the econoline chassis with the 460. No mechanical pump that I can find. The fuel lines run down the driver's side of the engine.
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Old 06-04-2018, 08:29 PM   #6
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Welcome and good luck with an interesting project.
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Old 06-04-2018, 09:11 PM   #7
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Thanks! Hopefully I get it sorted pretty quick here.
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Old 06-05-2018, 06:59 AM   #8
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Hi Chuck! Welcome to IRV2! We're sure glad you joined the gang!

Congrats on the new rig! You'll get all the bugs out soon. Keep her between the ditches!

Good luck, happy trails, and God bless!
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Old 06-05-2018, 07:11 AM   #9
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Maybe...

If its carb'ed, I'd be looking for a mechanical pump. (you said it didn't have one) If it has an external electric pump, It should be able to pull fuel through a bad internal pump.

If its carb'ed, the pump needs to be low pressure, about 6psi.. If its a high pressure pump, It could push fuel past the carb float valve and flood the engine..

If its carbed, pull the fuel line off the carb and do a flow test.. Check the fuel pressure (shouldn't be higher than 6psi) also put the line in a bucket, and run the pump for about 60 seconds a to see how much fuel your pumping. I'd guess 1/2 gallon per minute would be minimum.. (guessing)
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Old 06-05-2018, 10:20 AM   #10
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Just throwing in my opinion....

Modern gas is very hard on older fuel systems, the ethanol swells up the older rubber lines and can restrict the flow.

If the in-tank fuel filter sock is full of crud (from years of sitting and debris collection) it can lower the pressure as well. And occasionally the pumps just get old and weak, as well as the electric supply running to them.

Fuel system needs a good going over. I would follow the advice from waiter21 and bucket check the flow before replacing any components, with the exception of the rubber lines.
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Old 06-05-2018, 12:02 PM   #11
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Hi Chuck


this place is great

Safe travels
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Old 06-05-2018, 03:08 PM   #12
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That low pressure pump makes a world of sense! One of the things I gotta work on is getting the carb, (it is carbureted btw!) Back together after the last guy hot wired in a new external pump that was doing exactly that. pushing fuel past the float valves and flooding the thing. That's when they gave up... after pulling everything apart...

We also have no voltage going to the switch on the fuel pump relay. I've traced the wire from that contact back through the harness to a point that splits off just before what I think is the ignition control module. Thinking there may be an issue in there. If that makes sense.

Thanks for all the help so far!!!
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Old 06-05-2018, 06:33 PM   #13
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If it has a working high pressure pump, then you can go to just about any auto parts store and buy a pressure regulator to reduce the pressure.
as others have said make sure your line are clear and replace all rubber lines with new. be sure to use a good Quality "Fuel Line" when you do. while assembling the carb be sure that everything is spotless. A tiny chunk of debris can plug up things
Good luck.
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Old 06-07-2018, 12:52 AM   #14
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If it has a working high pressure pump, then you can go to just about any auto parts store and buy a pressure regulator to reduce the pressure.
as others have said make sure your line are clear and replace all rubber lines with new. be sure to use a good Quality "Fuel Line" when you do. while assembling the carb be sure that everything is spotless. A tiny chunk of debris can plug up things
Good luck.
It seems the pump on there is no longer functional. I ran a wire from the battery and got no reaction out of it at all.
Got any recommendations on the correct pump for the carb? I'm seeing really wide ranging options from search results.

Another great irony is that the guys who did a number on it took the carb out without labeling any of the vacuum and emissions lines. They said they intended to service the float valves. But, apparently this holley carb is designed so you can do that without taking it off the engine... now I gotta basically learn the crap out of all the different connections and hoses gong into the carb.... I just ordered a repair manual for the ECONOLINE chassis that the motorhome is built on, so that will help me get things finished up.
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