Weird rb problem, stumped

[username]

In the process of finishing up my rb25 swap into my s13. Car was running fine last week. I go to start it and take it around the block after installing my new sparco seat and as soon as i back it out of the garage it shuts off. It sounds like the car is running out of gas. It's got plenty of gas(3/4 tank), new walbro pump, and new fuel filter. Now here's the weird parts... The car will run when any of the back part of the car is jacked up. Runs fine, revs fine, but as soon as you put it back on the ground it acts again like its running out of gas and shuts off. I checked under the car for any kinks/pinched fuel lines (stock lines) and they're all fine. Yes the lines are routed correctly and not on backwards. I disconnected the return line at the tank and fuel is making its way back to the tank so im assuming there are no blockages. I even borrowed my friends walbro pump out of his sr car and same thing. If anyone has any suggestions it's greatly appreciated. i'm completely lost.

[blingbling]

sounds like one of the strangest things ive ever heard to be honest.

[Couped_up'd]

Hmm.

I would be looking at the fuel tank/pump a lot more. Seems that is where the problem is. Dented gas tank? All wires conected correct when you installed pump?

Also, check your black and pink stripe wire on the engine harness. You can run 12v power to the pump and see if the car runs fine (switched). If it does, your engine harness black/pink stripe fuel pump wire is losing connection.

Also change the fuel filter if you have not already.

[username]

Hmm.

I would be looking at the fuel tank/pump a lot more. Seems that is where the problem is. Dented gas tank? All wires conected correct when you installed pump?

Also, check your black and pink stripe wire on the engine harness. You can run 12v power to the pump and see if the car runs fine (switched). If it does, your engine harness black/pink stripe fuel pump wire is losing connection.

Also change the fuel filter if you have not already.

Gas tank itself is fine, no dents/clean. Yeah all the pump wires are hooked up right, even tried my friend's whole fuel canister with walbro with same problem.

Should i maybe try doing the fuel pump hard wire? Wiring in a new relay so it gets the full 13volts or w/e it is instead of running off the stock harness?

[davirene]

Pull the fuel pump....look inside the tank for debris....something might be plugging up the fuel sock...

[Tulok]

Fuse box, fuses and wiring
try hard wiring the pump to test.
make sure your fuel pump sock isn't clogged, broken, etc.
fuel pressure regulator vacuum line in good condition.

[username]

I pulled the pump to try a friends walbro pump and my sock was still good, nothing on it. I swapped FPR's from another rb25 fuel rail i had laying around. Looks like i'll be trying hard wire the pump to see if that fixes anything.

[username]

Ok just went to hardwire the pump with a relay and now the pump wont come on. The fuse is fine. Can someone verify this is right? This is the diagram i used...

85: Blue/red from plug
86: chassis ground.
30: Battery
87: Blue/red from pump
Also grounded the white/purple from the pump to the same ground as the relay.

[s14fbs]

are you using jdm gas that could be your problem ?

[nismoman]

are you using jdm gas that could be your problem ?

WTF is jdm gas???

[username]

Dont listen to him, kid's an idiot <3.... Figured out my problem, for some reason it was my wideband so for now i just unplugged it and the car runs fine.