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Old 09-24-2017, 07:20 AM   #1
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? about Onan 7000 fuel pump install

I have ordered a new fuel pump for my Onan 7000 and it looks very straightforward to replace with one exception.
The fuel line coming from the gas tank basically pressure fits with a little hose clamp onto a barbed fuel filter. That is easy to disconnect/reconect. My question though is how do I connect the other side of the fuel pump which is female threaded to the hose that then feeds the generator? In other words, is there some type of male threaded coupling that fits into the female threaded fuel pump and then attaches to the fuel line? If so, is that reusable? Or is that something I need to order in advance before I change the pump? I ask because I cannot see this connection (my view is blocked by the fuel pump itself) and I am afraid to take it all apart and realize I do not have the right fitting to complete the job
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Old 09-24-2017, 08:27 AM   #2
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Quote:
Originally Posted by GipseyDanger View Post
I have ordered a new fuel pump for my Onan 7000 and it looks very straightforward to replace with one exception.
The fuel line coming from the gas tank basically pressure fits with a little hose clamp onto a barbed fuel filter. That is easy to disconnect/reconect. My question though is how do I connect the other side of the fuel pump which is female threaded to the hose that then feeds the generator? In other words, is there some type of male threaded coupling that fits into the female threaded fuel pump and then attaches to the fuel line? If so, is that reusable? Or is that something I need to order in advance before I change the pump? I ask because I cannot see this connection (my view is blocked by the fuel pump itself) and I am afraid to take it all apart and realize I do not have the right fitting to complete the job
I would think that you should be able to reuse the current connections.
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Old 09-26-2017, 01:50 AM   #3
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They are pretty simple. I have an Onan 4000. Put a new fuel pump on it and it runs great!!!!!!
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Old 09-26-2017, 03:07 PM   #4
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They are pretty simple. I have an Onan 4000. Put a new fuel pump on it and it runs great!!!!!!
I ran into a simple problem, but I can't figure out how to work around it. It's easy to access one of the bolts holding the fuel pump, the other is blocked by the frame that actually holds the generator. So, I can't get a socket to it. Any ideas?Click image for larger version

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Old 09-28-2017, 01:38 PM   #5
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? about Onan 7000 fuel pump install

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Originally Posted by GipseyDanger View Post
I ran into a simple problem, but I can't figure out how to work around it. It's easy to access one of the bolts holding the fuel pump, the other is blocked by the frame that actually holds the generator. So, I can't get a socket to it. Any ideas?Attachment 177909

I'm assuming your looking up at the bottom of the generator in this picture correct??? Depending what year your RV is, some Onan generators are mounted on a sliding drawer type of mechanism so you slide the generator out and work on it without having to remove it from the Motorhome. Another thing. Tight spaces like this are where an open end wrench comes in really handy for me. So if you can slide the right size of open end wrench up in there, you might just be able to get the bolt off. I'd have a couple of bottle jacks handy just in case partial remove of the generator is required. Be careful the average Onan genset weighs about 400 to 500 pounds so you can never be to careful. Easier yet you could just bypass this fuel filter all together and add a little extra fuel line with clamps and install a new filter in an easier to reach location.
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Old 09-28-2017, 02:17 PM   #6
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I'm assuming your looking up at the bottom of the generator in this picture correct??? Depending what year your RV is, some Onan generators are mounted on a sliding drawer type of mechanism so you slide the generator out and work on it without having to remove it from the Motorhome. Another thing. Tight spaces like this are where an open end wrench comes in really handy for me. So if you can slide the right size of open end wrench up in there, you might just be able to get the bolt off. I'd have a couple of bottle jacks handy just in case partial remove of the generator is required. Be careful the average Onan genset weighs about 400 to 500 pounds so you can never be to careful. Easier yet you could just bypass this fuel filter all together and add a little extra fuel line with clamps and install a new filter in an easier to reach location.
Thanks. Yes, that is the view from the bottom. I cannot reach in there to get an open-end wrench, but I did order a flexible socket extension that I am hoping will work. If not, I may try the alternate mounting location as you suggest. Thank you.
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Old 09-28-2017, 09:29 PM   #7
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Very unusual location for a fuel filter on an Onan genset. A lot of it is how the Motorhome manufacture installed the generator in the first place. Mine was much easier to replace. After a new fuel pump, filters, oil and plugs mine runs flawlessly. Any case let us know how it goes.

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Old 09-29-2017, 06:29 PM   #8
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Very unusual location for a fuel filter on an Onan genset. A lot of it is how the Motorhome manufacture installed the generator in the first place. Mine was much easier to replace. After a new fuel pump, filters, oil and plugs mine runs flawlessly. Any case let us know how it goes.

Attachment 178168
So; I used a flex socket extension and it allowed me to get the hard to reach bolt out. I added some wiring, and some fuel line to make it easier to change in the future. Here is a picture, I'm going to add some type of insulation to the electrical lines but I need to go get some. It started much, much faster than it has in the past, but I will still have to test it over the weekend by letting it run for an extended periodClick image for larger version

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Old 09-30-2017, 06:25 PM   #9
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So; I used a flex socket extension and it allowed me to get the hard to reach bolt out. I added some wiring, and some fuel line to make it easier to change in the future. Here is a picture, I'm going to add some type of insulation to the electrical lines but I need to go get some. It started much, much faster than it has in the past, but I will still have to test it over the weekend by letting it run for an extended periodAttachment 178239
I just ran it for several hours and then finally shut it off. My fingers are crossed that the fuel pump was the issue
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