fuel pump/vro confusion

[rboat99]

I have an 89 OMC 140 seadrive. My mechanic disconnected and plugged the VRO after a rebuild last year.<br /><br />Since I bought the boat I have what I think are fuel starvation problems and now I am to the point that I am thinking of replacing or rebuilding my fuel pump. I read through a few posts here and I am now under the impression that my VRO may also act as the fuel pump.<br /><br />Is this is true? If so, should I rebuild the VRO or do I purchase a non-VRO pump?

 

[DJ]

Re: fuel pump/vro confusion

The oil injection pump has two chambers. One pumps fuel, the other pumps oil. If the system was disconnected, then only the fuel pump side is working.<br /><br />So, yes, the old oil injection pump may be used as a fuel pump only.

 

[rboat99]

Re: fuel pump/vro confusion

Is it worth it to rebuild this pump, or should I just buy a replacement of this pump, or buy a non-VRO pump?

 

[truax42]

Re: fuel pump/vro confusion

rboat,<br />i just had a vro/fuel pump go bad on my 89 120 evinrude. replacement cost was near 300 dollars for a vro or just 129 for a replacement fuel pump. you have to take your gas cap off to put gas in so why not put your premix oil in as well and save a few hundred dollars.

 

[DHPMARINE]

Re: fuel pump/vro confusion

The choice is yours,rboat99! Either way works.Premix always did.The advantage of the VRO Pump is that is variable.50 to 1 at full speed,lots less at idle.Less loading up,bogging down.<br />DHP

 

[rboat99]

Re: fuel pump/vro confusion

does the $129 fuel pump mount up the same way as the vro/fuel pump or do I have to make some other mods?

 

[rickdb1boat]

Re: fuel pump/vro confusion

I beleive there is a bracket that needs to be fabricated for the fuel only replacement. But it supposed to be no big deal. Others have done it and hopefully they will chime in..

 

[truax42]

Re: fuel pump/vro confusion

rboat,<br />the fuel pump replacement i bought actually used the mounting bracket from the old vro. not sure if that may be the same case as yours but it wont take much modification if it dont

 

[rboat99]

Re: fuel pump/vro confusion

I picked one up Monday and installed it yesterday. I was able to use the mounting bracket from the old unit as truax said.<br /><br />The only problem I had was with the threadlock solution I bought to put on the pulse limiter (flame arrestor). I put some of that stuff on, started to thread it in the block, but then had to stop to take care of some other things (honey-do's). I thought I cleaned all of the threadlock off but apparently there was still some left. When I went to thread the pulse limiter in the next day I could not get it to go, no matter how much cleaning and brushing I did.<br /><br />I finally got frustrated and took it to a mechanic down the street and he ran a thread tap through and helped me get it in. <br /><br />After overcoming that stupid mistake everything else went smoothly, can't wait to try it out this weekend! Thanks guys for all of your help!