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Is the check engine light coming on and staying on? Do you know what codes are being set if it is? We can set up a live phone call if you would like, but lets get some basic info first.
So I take it you have a duel fuel tank set up correct? Do you know what the fuel pressure is at the fuel rail?
So you have a pusher pump in tank and a pressure pump on the frame rail?
OK you said you had both pumps replaced?????
You have to forgive me but I have never seen two fuel pumps on one assembly. When I look up the fuel pump I only see one. Do you still have the old parts?
Can you send me a pic of what you have please?
ok so I am not crazy. I do not know why there would be two pumps. Where they stacked on top of each other?
See if you can get a fuel pressure gauge so we can see what the pumps are doing as well please.
I will look more into this tonight, as you have me stumped and I hate when I get stumped. What time tomorrow do you want to get back together and do some testing?
I do not go to bed for another 7 hours, and get up around noon. If you want to work on it say around 10 I can be back onlline to help you then.
10 am. That way we can work on it together to see what we can find.
It is 11.35 pm here now.
Chat with you in the am.