Hi guys, i just acquired a 1991 27' fleetwood class c rv. It sat for about 8 years before i bought it. I've since drained the old gas, new fuel filter, trans flush, motor flush and new battery. It fired up and ran like a champ for about 300 miles. Now I'm having a issue where after driving for about 5 miles and reaching running temperature it bogs down so bad it won't down shift and will eventually stall if you try to accelerate at all. After it sits over night it runs strong, for about 15 min.. then gradually bogs down till i have to pull over. revs fine in natural, so this is a issue under load. I took it to a trans shop, they said not a trans issue in their opinion, feels like a clogged cat to them. i removed the cat, still has has the same problem. any ideas? THANKS FOR ANY HELP!!

Your engine mechanic says what? Timing? Thermostat? Water pump? Blockage in cooling system? All cylinders ok?

Fuel pump would be my first thing to check or replace.I assume it has a carburetor.

time2roll wrote:Fuel pump would be my first thing to check or replace.I assume it has a carburetor.A 91 460 should have EFI, my 89 F250 did.

Stuck heat riser baffle in the exhaust ???????

I had a similar experience with a car I bought that had sat for a few years. I ended up having to pull the fuel tank and clean all the corrosion out and replace all the fuel lines, filter, pump, etc.Like yours, it worked fine for a while till enough sloshing around in the tank loosened up the corrosion. I found out when I pulled the fuel filter and found it full of rusty silt,

Ford 7.5L 460 loss of power when hot | Good Sam Community

38 Replies

time2roll
Nomad
May 11, 2017
It does sound like a fuel problem.
Jerrybo66
Explorer
May 11, 2017
matt7591 wrote:
Had a problem with a gas cap. True story. Created a vacuum in the fuel tank that prevented pumping fuel to fuel injection. This among the other things listed could be the issue.

Do you hear the fuel pump whirring?

I have to agree with Matt... Been there, done that also..
matt7591
Explorer
May 11, 2017
Had a problem with a gas cap. True story. Created a vacuum in the fuel tank that prevented pumping fuel to fuel injection. This among the other things listed could be the issue.

Do you hear the fuel pump whirring?
wrgrs50s
Explorer
May 11, 2017
I had a similar experience with a car I bought that had sat for a few years. I ended up having to pull the fuel tank and clean all the corrosion out and replace all the fuel lines, filter, pump, etc.

Like yours, it worked fine for a while till enough sloshing around in the tank loosened up the corrosion. I found out when I pulled the fuel filter and found it full of rusty silt,
Jerrybo66
Explorer
May 11, 2017
Stuck heat riser baffle in the exhaust ???????
rhagfo
Explorer III
May 11, 2017
time2roll wrote:
Fuel pump would be my first thing to check or replace.
I assume it has a carburetor.

A 91 460 should have EFI, my 89 F250 did.
time2roll
Nomad
May 11, 2017
Fuel pump would be my first thing to check or replace.
I assume it has a carburetor.
Lwiddis
Explorer II
May 11, 2017
Your engine mechanic says what? Timing? Thermostat? Water pump? Blockage in cooling system? All cylinders ok?

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Ford 7.5L 460 loss of power when hot

38 Replies

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