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Old 08-22-2011, 12:46 PM   #1
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454 quits on hills

Allegro 24 ft class A motorhome, 454 engine, runs out of power on hills, removed fuel tank and cleaned it out, blew out all the lines, has new electric pump installed, new filters, runs fine on flat roads, start to go up hills, acks like it is running out of fuel, has new electronic ingition installed also, after it quits on hill, can restart and idels fine, but no power to clime hill, thanks in advance for replys, George.
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Old 08-22-2011, 12:52 PM   #2
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on filters did you do the one in carb then the one on frame rail over rear end
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Old 08-22-2011, 02:07 PM   #3
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Well IMHO you have NOT provided e'nuf info on the rig...
Does the engine have a carb?
How about a mechanical fuel pump on the engine...
How big is the electric fuel pump and are you sure it pumps....

Jim
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Old 08-22-2011, 02:17 PM   #4
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Does sound like a fuel delivery problem. Easiest way to diagnose is with a pressure guage tapped in to the fuel injection rail or carb. inlet (whichever you have)

Tape the guage to your windshield facing the driver, and look for a pressure drop when the problem shows up.

If the presssure does drop, then follow normal trouble shooting to pin down the source of the problem.
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Old 08-22-2011, 02:46 PM   #5
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Nope Cat converter, guarantee it. If it has one , take it off. Otherwise change the muffler system.
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Old 08-22-2011, 02:56 PM   #6
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Yes, a plugged cat is ONE possibility also. Usually simpler to test fuel pressure than to deal with rusted bolts, etc. to drop the exhaust for a test.

However, if the exhaust can be easily disconnected in front of the cats (assuming that it has 2), it would be a good test to run.
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Old 08-22-2011, 03:54 PM   #7
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The funny thing about vapor lock is that a pressure gauge can read fine for a carb system (7lbs) but the line is dry as a bone. The guage can be just reading dry vapor pressure. Unfortunantly, the engine does not run on vapor.

Dave.
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Old 08-22-2011, 04:14 PM   #8
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I guess that adding a 1 foot loop of clear hose would help.
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Old 08-22-2011, 04:51 PM   #9
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If the catalitic converter stops up it will also overheat. Is it overheating?
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Old 08-22-2011, 05:02 PM   #10
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I put clear hose on my delivery line nest too either the carb or injector pump . Go through the rpm scale and as soon as you see bubbles,thats your problem.
It could be just a small crack in your rubber fuel line that cannot be seen .
Sometimes the cannister fuel filters for diesels are sucking air at the gasket.

I learned this the hard way. suspecting a fuel starvation problem which had the symptoms you described on your 454,I started from the tank replacing all fuel lines up to and short of the engine compartment.
I still had the fuel starving problem when under load .
In the engine compartment i looked the lines over, took them off,saw no leaks and no cracks. Still had the problem though.
I decided to put a clear fuel line of about a foots length so I could see what was going on. Sure enough, lots of bubbles above idle. I should have done that first.
On the other hand if one section of fuel lines is bad,the others may not be far behind.
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Old 08-22-2011, 06:23 PM   #11
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Make sure the fuel pump in the tank gets turned on after the engine is started.
With my unit earlier this year, the switch that is tied to the same line as the oil pressure sending unit blew apart. I waited until I got home to fix it. It ran fine except for the hills. If the hill was a little to tall I had to back off from the throttle to keep the engine from hesitating and backfiring. Other than that it ran fine on the flats.
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Old 08-22-2011, 08:13 PM   #12
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Thanks Everyone, will continue checking, will post what i find out. George.
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Old 08-23-2011, 01:52 PM   #13
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I guess what I was trying to say was, The switch that is tied to the oil pressure line is what turns on the fuel pump in the fuel tank once the engine is started. I guess the purpose is to keep the fuel pump from constantly running if you were to just have the ignition on.
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Old 08-23-2011, 10:58 PM   #14
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I have had the baffles in the mufflers break loose and pile up at the outlet. Usually this will discolor the zinc plating on the muffler. The muffler will also rattle if you thump it hard with a rubber hammer or your palm.
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