1992 Pace Arrow Bathroom Plumbing Diagram Guide

Owning a classic 1992 Fleetwood Pace Arrow is a prideful experience, but dealing with aging infrastructure can quickly turn that pride into frustration. If you are staring at a wet floor or low water pressure, finding a accurate diagram of bathroom plumbing on a 1992 Pace Arrow is the first step toward a dry, functional coach. You are not alone in this struggle; many RV owners face similar challenges with vintage models, and understanding your specific system is key to efficient repairs.

In this guide, we will break down the typical plumbing layout for this era of Class A motorhomes, identify common failure points, and provide actionable steps to troubleshoot issues. Whether you are a DIY enthusiast or just want to understand what your technician is looking at, this resource is designed to save you time and money.

Understanding the 1992 Pace Arrow Plumbing Layout

To effectively troubleshoot, you must first visualize where the water goes. While Fleetwood did not publish a single universal schematic for every custom build in 1992, the core architecture of the Pace Arrow followed a consistent industry standard for Class A diesel pushers of that era.

The Fresh Water System

The fresh water system in a 1992 Pace Arrow typically operates on a demand-based pressure system. When you turn on a faucet, the 12-volt water pump (or city water pressure) pushes water through PEX or Polybutylene tubing (common in the early 90s) to the fixtures.

Key components include:

• Water Pump: Usually located in an exterior bay or under a sink.
• Accumulator Tank: A small tank that maintains pressure and prevents the pump from cycling on/off too rapidly.
• Check Valves: Prevent backflow into the fresh water tank when using city water.

The Drain-Waste-Vent (DWV) System

Unlike residential homes that use rigid PVC glued joints, RVs like the Pace Arrow often use flexible ABS or specialized RV-grade piping to withstand road vibration. The bathroom drains (sink, shower, toilet) converge into a main line that exits through the “dump valve” handle assembly, usually located in a basement storage compartment.

Expert Insight: According to general engineering principles outlined on Wikipedia’s page on Plumbing, proper venting is critical to prevent siphonage of trap seals. In RVs, this is often achieved through an Air Admittance Valve (AAV) under the sink rather than a roof vent, which is a common point of failure in older models.

Common Plumbing Issues in 1992 Fleetwood Models

Before diving into the diagram, it is helpful to know where things usually go wrong. The 1992 model year sits in a transition period for materials, which presents unique challenges.

1. Polybutylene Tubing Failure

Many 1992 RVs used gray Polybutylene (PB) tubing for fresh water lines. This material is notorious for becoming brittle and cracking at the fittings after 20–30 years.

• Sign: Dampness under sinks or in cabinet corners without an obvious leak source.
• Fix: Replace PB tubing with PEX-A or PEX-B immediately.

2. Leaking Shower Pan

The fiberglass shower pan in the Pace Arrow is bonded to the floor. Over three decades, the sealant can degrade, or the pan can develop hairline cracks due to flexing.

• Sign: Water pooling in the bathroom floor after showering, but not while the sink is running.

3. Toilet Seal Degradation

The rubber seal between the toilet base and the black tank flange dries out.

• Sign: Odors in the bathroom or slow draining.

Step-by-Step: Tracing Your Specific Diagram

Since factory diagrams are rarely available online for specific VINs, you must create your own “as-built” diagram. Here is how to map your diagram of bathroom plumbing on a 1992 Pace Arrow accurately.

Step 1: Locate the Access Panels

Most plumbing connections in a Pace Arrow are accessible from outside the coach or via removable interior panels.

• Check the exterior bays near the bathroom location.
• Look for access panels under the vanity sink inside the bathroom.

Step 2: Identify the Water Source

Trace the lines from the bathroom fixtures back to the main manifold.

• Hot Water: Follow the line to the water heater (usually 6 or 10 gallons in this model).
• Cold Water: Follow the line to the main distribution block.

Step 3: Map the Drain Lines

Open the dump valve compartment. Identify which handle controls the bathroom.

• Pull the handle slightly and listen for water movement.
• Note if the shower and sink share a common drain entry point (they often do in compact RV designs).

Comparison: Factory vs. Aftermarket Modifications

Table 1: Comparison of original 1992 plumbing specs vs. modern upgrades.

Troubleshooting Based on the Diagram

Once you have traced your lines, use this logic flow to diagnose problems.

Low Water Pressure in Bathroom

If the kitchen has good pressure but the bathroom does not:

1. Check the aerator on the faucet. Mineral buildup is common in older RVs.
2. Inspect the shut-off valves under the sink. They may be partially closed or corroded.
3. Look for kinks in the PEX/Polybutylene line behind the vanity.

Water Heater Not Supplying Hot Water

1. Verify the bypass valves. In winterization mode, the water bypasses the heater. Ensure the valves are set to “Normal” operation.
2. Check the anode rod. If it is heavily corroded, it can restrict flow.
3. Test the heating element (if electric) or the gas burner assembly.

Persistent Odors

If you smell sewage in the bathroom:

1. Check the toilet seal. Add water to the bowl to ensure the trap is full.
2. Inspect the sink drain trap. RV traps are shallow and can dry out quickly if the RV sits unused.
3. Verify the AAV (Air Admittance Valve) under the sink is not stuck open.

Maintenance Tips for Longevity

Preserving the plumbing in a 30+ year-old motorhome requires proactive care.

• Winterize Properly: Always use compressed air to blow out lines rather than just draining them. Residual water in low spots can freeze and crack fittings.
• Use RV-Specific Toilet Paper: Standard home toilet paper does not break down quickly enough and can clog the older, narrower waste lines of the 1992 Pace Arrow.
• Inspect Seals Annually: Apply a silicone-based sealant to the shower pan edges and around the toilet base every spring.

FAQ Section

Q1: Where can I find the original factory plumbing diagram for my 1992 Pace Arrow?

A: Original factory blueprints are rarely available to the public. Your best bet is to contact Fleetwood Owners Groups on Facebook or forums like iRV2.com. Often, long-time owners have scanned copies of manuals for specific floor plans. Alternatively, you must trace the lines yourself as described in this guide.

Q2: Can I replace Polybutylene pipes with PEX myself?

A: Yes, this is a very common DIY project. PEX is flexible and easier to work with in tight RV spaces. Ensure you use the correct fittings (crimp or clamp style) and support the lines adequately to prevent vibration damage.

Q3: Why does my bathroom faucet sputter air?

A: This usually indicates a leak in the suction side of the water pump or a loose connection in the fresh water tank pickup tube. It can also mean the water level in your fresh tank is low, causing the pump to draw in air from the vent.

Q4: What size are the plumbing lines in a 1992 Pace Arrow?

A: Most fresh water lines in this era are 1/2 inch for main runs and 3/8 inch for fixture supplies. Drain lines are typically 1.5 inch for sinks/showers and 3 inch for the toilet/main waste line.

Q5: How do I fix a leaking shower drain in a fiberglass pan?

A: If the leak is at the drain flange, you may need to remove the drain cover and replace the rubber gasket and putty. If the pan itself is cracked, you can use a fiberglass repair kit, but replacement of the entire pan is often more reliable for long-term integrity.

Q6: Is it worth upgrading the plumbing system entirely?

A: If you plan to keep the RV for more than 2 years, yes. Replacing old Polybutylene with PEX and installing individual shut-off valves increases reliability and resale value. It also makes future troubleshooting much easier.

Conclusion

Navigating the complexities of a vintage RV requires patience and the right information. By understanding the diagram of bathroom plumbing on a 1992 Pace Arrow, you empower yourself to tackle leaks, pressure issues, and maintenance tasks with confidence. Remember, the key to a healthy RV plumbing system is regular inspection and proactive replacement of aging materials like Polybutylene tubing.

Don’t let a small leak ruin your travel plans. Use this guide to map out your system, identify weak points, and make necessary repairs. If you found this guide helpful, please share it with fellow Fleetwood owners on social media or RV forums. Your shared knowledge could help another traveler stay dry and happy on the road!