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Old 05-29-2016, 07:17 PM   #15
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Quote:
Originally Posted by justimagination View Post
Don't the fuel filter in the Carb, as well as the engine fuel pump.
Yes sir, all the Quadrajets have a small filter about the size of an average pinky finger inside the carburetor fuel inlet. Due to their size they plug fairly easily. In the past I always plumbed a small inline filter before the carb to take most of the dirt out so the difficult-to-access one stays clean longer. Make sure when replacing the filter the neoprene check valve faces the fuel line.

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Old 05-30-2016, 10:57 AM   #16
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There is also an in-line fuel filter approx. halfway between the fuel tank and engine. Kinda hidden along by the passenger side frame rail. Our 1983 P-30 Winnebago had this filter, and there is also one on our 1999 Safari TREK, so my assumption is that the installation was continuous during this time span.

On the 1983 Quadrajet engine, a partially clogged filter would cause a stumble at highway speeds, and the 1999 fuel injected engine would display a "Service Engine Soon" light on the dashboard.

Quote:
Originally Posted by bill06447 View Post
Yes sir, all the Quadrajets have a small filter about the size of an average pinky finger inside the carburetor fuel inlet. Due to their size they plug fairly easily. In the past I always plumbed a small inline filter before the carb to take most of the dirt out so the difficult-to-access one stays clean longer. Make sure when replacing the filter the neoprene check valve faces the fuel line.

Bill
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Old 05-30-2016, 02:04 PM   #17
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agree it will be a ford filter
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Old 05-31-2016, 10:31 AM   #18
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Were you able to use the main tank at all when the solenoid failed? I'm able to run the RV off of the main tank, I just get some hesitation at high RPM only when running off of the main tank. Was the other picture in my latest post a fuel pump? It has a line in/out from the main tank and an inline filter just after it.
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Old 05-31-2016, 11:14 AM   #19
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Elec. pump/filter in tank, filter under pass. butt, mech. pump on engine and inlet filter at carb.
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Old 05-31-2016, 08:41 PM   #20
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Were you able to use the main tank at all when the solenoid failed? I'm able to run the RV off of the main tank, I just get some hesitation at high RPM only when running off of the main tank. Was the other picture in my latest post a fuel pump? It has a line in/out from the main tank and an inline filter just after it.
Not sure who this question is directed to.

The solenoid chooses between two tanks, so it can clearly fail in either position. In my case, it failed in favor of running from the aux tank. (but part of it must have been broken, because it would direct the return line into the other tank.)

It all got better after I changed it out. I still had problems with the main tank in that the pick up in the tank was faulted, but at least it would run well on the aux tank, and when I switched to the main tank, it would eventually starve for fuel, as that tank had a problem inside the tank at the pick up tube...
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Old 06-02-2016, 07:38 AM   #21
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The problem is not the pump. The engine should run fine without the auxiliary electric pump. The purpose of the electric pump is to prevent vapor lock. Engines run hot in motorhomes, which vaporizes the fuel within the lines. The aux pump helps to prevent that. If your engine is cold and will run at idle, you do not have vapor lock and therefore do not have a bad pump.

Has to be a filter or a fuel line between the tank and the valve that switches between the two tanks - particularly that it will run on the reserve tank.

just as an additional note, they did not start putting the pump inside the tank until they went to fuel injection in the 90s.
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Old 06-03-2016, 03:01 AM   #22
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just as an additional note, they did not start putting the pump inside the tank until they went to fuel injection in the 90s.
Actually, that's not quite right. Winnebago and others did put the aux pump inside the tank for carburated models. My '88 chassis has an in-tank pump with a carb. Don't know about the Executive, but the P30 manual says that "Some units are built with both mechanical and electric in tank pumps." I guess it depends on what the body builder ordered from GM. You can check how many wires go to the tank. If there is more than 2 there's most likely a pump in there.

The carb version of the in tank pump looks very much like a fuel injected pump only with less pressure.

Let me know if you want pictures of the pump and filters ('88 P30 chassis)
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Old 06-03-2016, 10:53 PM   #23
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Thanks everyone for the help! Ended up being bad wiring to the electric pump outside of the main tank. There were no fuel pumps in the tank. Pulled the tank anyway to have it dipped and sealed. Thanks again everyone for the help! Guess it might have been vapor lock after all at high RPMs?
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Old 06-04-2016, 01:39 AM   #24
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Good to hear that you got it sorted!
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