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I would love a 40 gallon tank from a box van, my shorty holds 16 gallons, and at 10-12 MPG it is constantly empty, it's killing me, gauge at 1/4 tank turns iffy, will read empty with 3 gallons in it.
Next step for me would be to replace the crossover valve. That is what directs the fuel back to the tank that the truck is currently running on. When the valve malfunctions, your trouble is the result. The one way valves added to the pressure lines was just a fail safe (recall). I never saw any that did what your is doing after adding the one way valves. Replace the selector valve. To my knowledge there is no rebuilding them even though some people may beg to differ. They operate on a vacuum signal and are touchy to say the least.
If the 2 return lines at the rear of the valve are crossed then, yes, that would send the excess fuel back to the opposite tank from the selected tank.
I have read in the past about some F-Series having issues where they flood one tank or the other but I am not sure if they use this same valve.
@annaleigh thanks for the information....I'm hoping it's just the filter, it runs fine at idle and in park you can rev the engine without a problem, just in drive gears it misses very bad and struggles to get to 50mph, even worse when at a stop then trying to gain speed, have to keep pumping the gas pedal like it's carbed.
Looks like I'll be looking for a new vacuum canister....Thanks
I know how u feel mines the same. But I got a new clutch so not slipping
Thanks for all this information. What if you have 1 fuel tank and 1 propane tank. I can switch between the 2 but the propane is disconnected for driving, and just use it for the cab. Would It be like I have 1 tank ?
Thanks for all this information. What if you have 1 fuel tank and 1 propane tank. I can switch between the 2 but the propane is disconnected for driving, and just use it for the cab. Would It be like I have 1 tank ?
Yes it's like only having one tank, even if Ford would have put a dual system in, they could not have combined the two different fuel lines together. Gas lines run to the pump(s) and the propane lines run to a regulator, two different systems. But I'm still betting you probably have a weak in tank fuel pump.
Well, bringing this thread back to life I guess. To refresh it's a 1990 E150 conversion with the 5.8L FI A4OD. After installing new tanks, new low volume fuel pumps, @manicmechanic007
Even sent me the check valves for the fuel lines and I replaced the switching valve twice. At that point I just decided to leave the front tank empty because it still continued to transfer gas to the rear tank and overflow it. Now it decided to switch things up on me and the wife and I were bringing the dogs back from the vet, it's only about a 15 miles drive but we started smelling gas real bad inside the van, What I found is the rear tank is now over flowing the front tank and the front tank fuel gauge no longer work so that portion of the fuel pump is no good. I bought them from Rockauto and I believe they were doth Delphi brand pumps, but any way, I switched over the the front tank and am in the process of running the front tank empty to get the tank dropped again, to I guess replace the fuel pump so it will read the gas gauge again. What else should I consider looking at while the front tank is lowered? I don't understand how the gas can flow from one tank to the other with the check valves installed on the lines.. All thoughts are appreciated as always Thanks..
I'd manually check those recall one way valves I gave you
They must be no good
Your problem should not exist with the valves installed
I do see them at the junkyard that are no good at times
i think the ones I gave you were brand new, but they would also be 15-20 years old too
Double check their function
To test
All you need to do is pull them back off and see if you can blow through them both ways
You should only be able to blow through the female end, blowing through the male end should be a no go
Thank you, If it's not raining when I get home I'll get it in the air and check the valves as you suggested. but I think I'm still going to have to pull the front tank pump again because of the fuel gauge not reading.
Also are these Check valves still available through Ford or will I have to cut the lines to install aftermarket?
Damn straight, and the return lines in particular, just realized your 1990 van has the crossover valve
It's probably no good , and a new one of those will solve your issue
Yours has 2 return lines out of that canister and just 2 lines to the engine (pressure and return)
That means either pump running, can back feed fuel back to either tank, if the crossover valve fails
Here's a bit of info out of the PCED about the valve
Once you get this fixed Mike, you do NOT need those valves with your system
Sell them on Ebay
They probably still work
Brain fart a long time ago when I sent you those valves, disregard my earlier post
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