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 > Your search for posts made by 'TUBE PULLER' found 4 matches.

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RE: 80's 454 fuel supply challenges

I did run a quick test of the pump connected directly to the battery at one point before realizing the issue with the switcher, and even bought a switch for just such a scenario. Will try that again with it all hooked up. Thanks enblethen for the new circuit tip. It still switches the gas gauges, but the power for the high flow, low pressure pump and the switcher are toast. Wonder if the relays back there are bad. Will have to put the ol' multimeter on it. Reading this got me to thinking, before bypassing everything as I suggested. You may want to bypass the "Switcher" by connecting the fuel lines together with a splice and hose clamps. That would eliminate another possible problem. If you change multiple things at the same time, you can not know what fixed the problem. PS, "Switcher" I am assuming you are referring to the electric solenoid that switches from one gas tank to the other.
TUBE PULLER 07/07/21 01:02pm Class A Motorhomes
RE: 80's 454 fuel supply challenges

Often connections on old rigs get a bit tarnished. I've seen it on one car (Wish I'd known it then) but unplug. Spray with De-Oxit. plug/unplug a few tines. Spray with the 2nd De-Ox-It. and they are good as new... Try unplug replug a few times first though as that will clean 'em De-ox-it slows the re-dirtying Caig De-Oxit has saved me many times, good stuff.
TUBE PULLER 07/07/21 10:45am Class A Motorhomes
RE: 80's 454 fuel supply challenges

I accidentally discovered I was getting low voltage to my fuel pump on the side of the road while broken down. It was the tenth time my RV died after trying everything under the sun just like you, I crawled underneath and put a meter on the fuel pump power supply wire right at the pump. I was only getting 8 volts, by the way, when a motor is supplied low voltage, it draws more amperage which in turn creates more heat. The same way people burn out their air conditioners at an RV park with low voltage during hot periods when everyone is drawing off of the system with high loads.
TUBE PULLER 07/06/21 05:33pm Class A Motorhomes
RE: 80's 454 fuel supply challenges

Simple Test for you. Old rig, old wiring, lots of resistance. 12 volts to the pump has lots of termination points before it gets to the pump. Fuse, relay, low oil pressure switch, an inertia switch and lots of harness plug connections. All of these things are old and either weak or corroded. I have seen this intermittent problem more than once. Test by running a fused, 12 gauge wire, directly from the positive battery terminal to the fuel pump positive connection. Remove the factory 12 power wire from the pump and tape it off and make sure the pump is grounded. Try it this way for awhile, if the problem never shows it's self again you know you need new fresh wiring to the pump. Of course, during this experiment you have to be aware of everything that is happening around you due to the fact that all the safeties have been bypassed. Good luck
TUBE PULLER 07/06/21 03:04pm Class A Motorhomes
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