Fuel pressure problem

[ttocs]

Do you have a place on the rail or a spot on the line that you could put a old school pressure gauge to check that it isn't the sender? If the harness starts to come lose it can skew the reading as resistance builds up after head causes it to expand so it isn't as tight a fit.

 

[I_LIKE_TURTLEZ]

Pretty confident the issue is the pump and/or hat assembly after more information came to light. His car ran for 2 years on the original pumps, his gradual high pressure issue started after switching brands from how I read it.

There's really nothing else it can be except the regulating driver module but surely he can't have two bad ones in a row, let alone without some sort of fault code.


The Walbro pumps claim to work like a variable voltage but it obviously isn't in his case for whatever reason, defective, voltage table etc. Apparently it's well documented these high-flow Walbro will burn themselves out on these cars, there's threads going back 20+ years with this exact scenario where guys kept burning them up immediately because they're turbine race pumps that don't want to work well with ECUs that have the processing power of a TI-83 calculator.

 

[Vince]

Pretty confident the issue is the pump and/or hat assembly after more information came to light. His car ran for 2 years on the original pumps, his gradual high pressure issue started after switching brands from how I read it.

There's really nothing else it can be except the regulating driver module but surely he can't have two bad ones in a row, let alone without some sort of fault code.


The Walbro pumps claim to work like a variable voltage but it obviously isn't in his case for whatever reason, defective, voltage table etc. Apparently it's well documented these high-flow Walbro will burn themselves out on these cars, there's threads going back 20+ years with this exact scenario where guys kept burning them up immediately because they're turbine race pumps that don't want to work well with ECUs that have the processing power of a TI-83 calculator.

Not the case the same thing happened with the first stock cobra pump . Which turned out to be the fuel tube burst going from the tee to the pump it was covered with a black mesh tubing you could not see it. got anther stock cobra pump it failed from high fuel pressure. I got the walbros because it has the pressure relief vavle to protect the pumps and lines .the walbro pumps are fine the car starts right up and drive normal

 

[I_LIKE_TURTLEZ]

Not the case the same thing happened with the first stock cobra pump . Which turned out to be the fuel tube burst going from the tee to the pump it was covered with a black mesh tubing you could not see it. got anther stock cobra pump it failed from high fuel pressure. I got the walbros because it has the pressure relief vavle to protect the pumps and lines .the walbro pumps are fine the car starts right up and drive normal

I think your original cobra pump simply quit coincidentally, there is special fuel hose you have to use inside of tanks, standard fuel line won't last long. If your old one burst from age it would have caused a lack of pressure, not increase, resulting in the pump burning itself out.

Your tuner guy claims the car is doing everything it should be to regulate your fuel pressure, which logically would send you back to the tank itself.

Take the car to an auto repair tech in your area so they can manually systematically test, really nothing more I can offer here except guesses as I was going in circles due to a lack of information/data.


Check out this screenshot, there's ones like this on every forum. You're probably the 100th guy to have this exact problem after "upgrading":