the wiring to fuel system on 1990 Ford E-350

i have a 1990 motor home and have wiring issues to fuel system

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2 answers
Depending on the class of your motorhome, you may want to call around to a local RV dealer to see if they can tackle wiring issues on your specific model. If you have no RV dealers, start by making calls to local shops to see if they have the room and a technician on board that can diagnose wiring problems.
What kind of issues?