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I have an 87 Pace Arrow with Chevy 454 – 4 bbl. carburetor. It comes with an electric fuel pump in the rear tank pushing fuel up to a mechanical pump at the engine. The fuel comes out of the tank thru ½” hose and through a metallic thing that might be a pressure regulator. The carburetor was replaced with a Holley match for the Rochester that comes standard. The only change was the Holley tech was to meter the jets for 5,000 feet as I live in Denver. Now the issue. On my latest trip, I drove up I-70 towards Eisenhower Tunnel. Pushes the engine hard and secondaries are kicked in most all the time. The engine does get warm, not hot, but the electric fans cool it down very efficiently. The MH has good power than after about 40 miles, the power cut out. For me to continue, I have to turn off the electric pump and just run on the mechanical. I believe the engine is flooding yet my fuel pressure gauge only shows 5 psi. As the pressure drops to about zero, the system is starved for fuel so I toggle the electric pump back on for a few seconds. Too long and the power drops again. Now it did not do this for the first 40 miles and does not do so first part of any driving trip, so potentially vapor lock comes into play, but why would it flood? I apologize for such a long question and thank you for reading.
May be 2-3 problems there, one is there must be some hose which are cracked,dry rot, loose hose clam & deteriorate from inside and air seep in, mostly on sucsion side and /or the mechanical pump is defective.
If deterioration of hose from inside, there may be some particule of rubber getting to the carb. and keeping the needle from seating properly mostly if the filter is all the way at the rear. (that metalic thing!!, may be your fuel filter).
An 87, if the hose never been replace, that would be the first thing I woul do, and use marine type.
wrench
I also live in Denver and have a lot of problems with losing power when I go up over Eisenhower Tunnel. My rig is a '72 Winnebago with a Dodge 413 engine. I also have a Holley 4 barrel. My plugs are always fouled when I get back to Denver. Anyone have any ideas? I'd also be interested in which shop in Denver worked on your Holley. Maybe they might be better tan the shop I take mine to.
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