I am running an electric fuel pump for my WVO set up-

I have a 3 port valve to control if diesel or WVO is going into the IP.

My question is: if I am using the electric pump for WVO, am I going to be building up pressue in my diesel fuel system when running WVO? Or is there something in the system that prevents excessive pressure from being accumulated in the stock fuel system?

Thanks,

If you have placed the 3 way valve after the mech pump then yes you will build pressure until something gives. Why would you want to run an electric pump over the factory mech pump though? I know they could possibly fail and feed fuel into the crankcase, but with regular maintenance that will rarely happen and will be very reliable. Just curious as I was going to use an electric pump, but changed my mind after some thought.

If you are set on running the electric pump, you can install a fuel block off plate to completely bypass the mech fuel pump.

RemingtonI am running an electric fuel pump for my WVO set up-

I have a 3 port valve to control if diesel or WVO is going into the IP.

My question is: if I am using the electric pump for WVO, am I going to be building up pressue in my diesel fuel system when running WVO? Or is there something in the system that prevents excessive pressure from being accumulated in the stock fuel system?

Thanks,

I was worried about running my diesel through all the heat before going into the IP-

So it sounds like I should block off my IP and put in another electric pump- which will allow me to keep my current set-up

stock lift pump is the ultimate wvo pump for these engines - the only electric ones that work as well cost like $500 and are way overkill for our purposes.
To answer your question, though, i think they are set to bypass at a certain pressure which is probably quite low - like less than 20 psi, maybe even less than 10 psi. Even the cheap plastic pollack valves should be able to handle that - and my hydraforce valves can handle hydraulic pressues so you probably won't blow anything out.

Paul

The pump is meant to bypass? or the valves are meant to bypass?

Can you see any big issues with putting a 3 port valve before the lift pump and one after it- so I would be switching between diesel and wvo- this would allow me to purge my wvo system all the way with diesel- by just drawing from the diesel tank and running diesel through it for 30 seconds on the wvo system and then switching back over the the stock diesel system to shut it down.

The pump is meant to bypass? or the valves are meant to bypass?

Can you see any big issues with putting a 3 port valve before the lift pump and one after it- so I would be switching between diesel and wvo- this would allow me to purge my wvo system all the way with diesel- by just drawing from the diesel tank and running diesel through it for 30 seconds on the wvo system and then switching back over the the stock diesel system to shut it down.


the pump will only build up a certain amount of pressure - i mean it's not going to just keep cranking all the way up to 200 psi or something like that. it maxes out at a specific pressure, which i believe is quite low and it probably has an internal bypass valve like a lot of other pumps do to prevent it from going to high.

the only reason i could think of for wanting to put another 3 port valve after the pump would be if you wanted to mount a flat plate heat exchanger right under the intake to get max heat transfer, then you could have the valve right before it to prevent diesel from going through. That way, if your other 3 port was just before the lift pump you could also get very fast purging. Then, add a third valve to loop your return while on wvo back to the supply before the lift pump and you are all set. I plan to add the FPHE under the intake one of these days, that's why i mention it.

Paul

I already have a FHPE mounted right before the IP which is why I was concerned about sending my diesel through it, but it sounds like I should be fine with the set up I have-

I might add another 3 port valve right in front of the lift pump though, and use the mechanical lift to pump both my fuels- it sounds like using an electric lift pump is just going to cause me a whole lots of problems down the road.

I bought 2 saddle bag tanks and am going to use 1 for diesel, since it is a smaller tank, so I have to re-route the fuel lines anyway, so it won't be much more work.

thanks for the advice.

I already have a FHPE mounted right before the IP which is why I was concerned about sending my diesel through it, but it sounds like I should be fine with the set up I have-

I might add another 3 port valve right in front of the lift pump though, and use the mechanical lift to pump both my fuels- it sounds like using an electric lift pump is just going to cause me a whole lots of problems down the road.

I bought 2 saddle bag tanks and am going to use 1 for diesel, since it is a smaller tank, so I have to re-route the fuel lines anyway, so it won't be much more work.

thanks for the advice.

definitely don't run diesel through the FPHE

Paul

cusipata , Your mecanical lift pump is rated for 6-8 psi and at that pressure a bypass operate automatically so you wont have any probleme with that part of you set-up . using a mecanical pump for both fuel tou will increase you purge time X10 or more . Why you use 3 way valve ? wy not use a pollak 6 way and control your return line at the same time ?

GREASE FIRE if a small % of wvo is present in the diesel it wont cause any bubble probleme going to a FHPE but you are right it is not a good solution another type of assemblage is requested.

Ed