Hello all,

This is an Onan 4000 watt 

Model# 4.0bf3cr16000b

I am having an issue that seems like a lot of people have had with my onan, will run only while holding start button, plenty of gas in the tank so i pulled the fuel line to see if gas was getting to the carb no gas...i tapped on the feul pump and it started pumping gas so i figured the pump was done...installed new pump and same thing no gas but if i tapped on the pump housing it would start pumping...can anyone shine some light as to what could cause this, i was thinking the original not running n issue was either the oil sensor (has plenty of oil) or i have heard of the R1 resistor going out, but just dont get the reason the pump would work if tapped on...any help would be greatly appreciated.

Thx, J

Views: 179

Reply to This

Replies to This Discussion

Grounds, specifically bad grounds. The ONAN gets pretty hot during running and so some bits get worn out during use. I used to be able to bang the genset with a rubber mallet to get it to start right, then realized all I was doing was jogging the relays and other electrical connectors to resolve the grounding issue. A good cleaning with electrical contact cleaner and making sure those clips are not totally fried to all the 2 billion white wires in the genset panel (why are nearly all the wires white?? Did someone just give up?). I've swapped out the two fuses back there for new knife types and replaced the start switch only to have two contacts just crumble on me. Not a good sign for continuity! Sometimes the exposure to moisture and not  being in the RV can age the contacts. Nothing  complicated but it is tedious to go through and clean and replace them.

RSS

Members

HOW TO MEMBER POSTS

  •         How To Links 

-Search Good Old RV's

-Start a New Group 

-Roof Repair Photos & Products

-Repair an RV Roof

-Pick Roof Sealer   

-Understanding RV Electrical Systems 

-Get RV Insurance   

-What to Look For When Buying a Used RV

-Jack Installs Fuel Injection in his Dodge 

 RV ARTISTS 

 

 Artist Roads                                              

                      

JOIN US AT GOOD OLD RVS

If you love classic and vintage RVs then come Join us. Come on in and have some fun. JOIN HERE NOW

Forum

Starcraft Ceiling Repair

Started by Donald Morgenroth in RV Repair & Maintence Mar 18.

Replacing controller ,? And inverter 1 Reply

Started by Dave King in Vintage & Classic RV Restoration & Purchase. Last reply by Rick Cornell Apr 27, 2023.

Sway Bar Links 2 Replies

Started by Grey Wolf in RV Repair & Maintence. Last reply by Grey Wolf Apr 22, 2023.

Events

Videos

  • Add Videos
  • View All

JOIN US - COME ON IN!

If you love classic and vintage RVs then come Join us.

 Come on in and have some fun.      

 Dedicated to a simpler, more rewarding and fun way of life in a Good Old RV... 

Vintage Travel Trailers, Vintage Campers, Camper Restoration, Bus Conversions, Vintage RV Forums, Old RVs, Tiny Homes, Boondocking

A work of art by member Paige Bridges

+++++++++++++++++++++++++++++

 Disclaimer - Please Read it

Enjoy this site and use it totally at your own risk.

By using or viewing this site YOU agree to Hold Harmless anyone associated with it including other members. Also, YOU agree that YOU are solely responsible for ANY and ALL actions, results or damages. Members "opinions" are just that and any repair or alteration comments or recommendations are by folks who are not licensed repair  or mechanical professionals. Any repairs or modifications you do totally at YOUR OWN RISK. Use licensed professionals for all work to avoid possible serious injury or damage. Use  banks for purchases.  Have fun!

Copywrite & Trade Mark Registered GoodOldRV© ,GoodOldRVs©, GoodOldRVs.com©,GoodOldRVs.net©,GoodOldRV.Com©

© 2024   Created by Jimco_W001.   Powered by

Badges  |  Report an Issue  |  Terms of Service