I plan on tearing the computer out of my 1991 RS. I've been told it affects the fuel pump and I've been told it doesn't. But if I have to change the fuel pump, is there any way I could use an in-line fuel regulator and bypass dropping the tank?

 

in-tank pumpsare always better than inline pumps. although im not sure about it affecting the pump. the 91s were tbi right? the fuel pump should, i believe, have a constant output, and the throttle body controls the fuel output to the engine.

only way the fuel pump is affected is if the computer increases voltage with rpm.

 

But what I'm planning on doing is doing a COMPLETE swap. Removing all computer components. From TBI to carburetor. I've been told so many different things about what I will have to do with the fuel pump that I'm just confused now.

 

if thats the case the safest route seems to be a walbro 255 in take pump which is run directly off the battery (or on relay). then you would need a fuel pressure regulator up by the motor. that ought to do it for you though.

 

Sweet deal. Much appreciated.....

Another thing...

I'm not sure about the numbers, but I'm pretty sure the current fuel pump pumps something like 6 times the pressure needed for a carburetor. Is there a regulator that will bring the pressure down by that much?....I mean, if I know what I'm even talking about.

 

Keep your electric pump in the tank. With the computer out, you're going to need to hot-wire the fuel pump to keep it running. Install a fuel pressure regulator under the hood, 4-5 psi is all a carb needs. Be sure to use a return style regulator, and connect it to your existing return line. The return line keeps fuel free flowing in a loop, returning what gas isn't being used by the engine. Without a return, the pump will be trying to push a lot more than the regulator will allow, which puts a strain on the pump and can make it burn out sooner.

 

Thanks. I really appreciate the help. I wasn't sure how possible it was to drop the pressure down to that required 4-5 psi.

 

Look online at places like Summit, Jegs. Check the rating on the regulator to make sure it will go down to the level you need. Ones designed for use with a carb will.

 

Thanks a lot. According to my specs...TBI should run between 9 and 13 psi. I was told something completely different earlier in the day. I think I'm all set now. Thanks for all your help.

 

sorry, i assumed u realized the fuel pressure regulator would do that. of course ive never had to install one so its still good that 69 came in here