Have heard it's a good idea to upgrade to an '85-'89 pump ?
Any suggestions for a replacement would be greatly appreciated.

 

I would advice against it. I was going to do the same thing but I got good advice here. You have about 13 psi with the current one. With the 84-89 fuel pump you will get considerably higher, about 60 psi or more. You need to make sure your fuel lines can handle the extra pressure etc. And all you gonna get is the 13psi. The regulator will be open more to return more to the tank. I had a Bosche high performence for a 85 and decided against it. I replaced my injectors and left it at that.

Kevin

 

Interesting, thanks for the help ! Sounds like a stock one should do then.

 

First, why do you want to replace it? Just for the sake of it? Because it's 1/4 of a century old? It makes noise?

The crossfire is very sensitive to fuel pressure, so the best thing to do first is get a gauge on there that you can watch while you drive. That way you can make sure that the pump is supllying all the pressure you need all the time. If you only check it at idle then you don't know what's happening under load.

I hate to have to say this but:

DO NOT RUN A LINE WITH PRESSURIZED FUEL INTO THE PASSENGER COMPARTMENT OF THE CAR!

If you do run a gauge inside the car, make sure it has an isolator. Autometer makes gauges like this.

Your pressure should be up around 14 PSI. DCS offers a slick tool to adjust it on the car. The pressure regulator is in the drivers side throttle body and is easily made adjustable. Scroll halfway down the page for the J-tool: http://www.crossfireinjection.net/catalog.htm

Let us know if you have any more questions!

 

Hey Marc - you forgot the "I'm gonna replace the filter screen that fell off --- so what the hell" excuse

I put a "85" pump in 2 yrs. ago ----- and had zero problems.

I think it runs better after the install -- but what do I know

 

Thanks for the info guys.

By the way, speaking of hating to say something, but where's the fuel filter ?

 

Rick, what year is your vette? It does not look like an 84.

 

Not sure what is going on here.....the first thing you should have done with your '84 is put an '85 fuel pump into it.

60psi out of a fuel pump??

 

Now I'm getting confused. Is it a good idea or not ?

 

Refer back to post #4

It's a good idea if for some valid reason you need to replace it. If you're just doing it to do it, then don't ask, just do it.

 

Ah...yeah...the '84 was found to be to weak at GM with the new L83 injected system, the '85 got the upgrade...your '84 should get one as well....

That is a nice yellow '84 that you have.....has it been six months since you bought that particular car yet?

 

Let's not assume that the OP is replacing things needlessly shall we?? Let's assume that he has a 'good reason' for wanting to attack the Fuel pump and leave the lecturing to his parents.

Fuel pressure is too high?? The '84 FPR is not adjustable??

84 is adjustable, you just need to knock out the plug on the base of the regulator. An 85 pump will definitely not hurt an 84. The regulator will knock down the pressure to stock settings if you do nothing and if you chose to make it adjustable you can go up to 14-15 lbs safely.

And before anyone starts quoting EFI-CFI, he even increased his Fuel pressure to 14psi when stock max is 13.....

Let's clarify a couple of things.

1. Pumps create FLOW...not pressure.
2. Restrictions to flow create pressure.

Think of it this way....if you ran the pressure hose from an 85 pump into a bucket, it would flow at near zero pressure. The restriction the pressure regulator gives is what causes pressure to build.

That said, the regulator on your rear throttle body will limit the pressure to 13 psi max, even with the TPI pump....The 85-91 pump doesn't create enough flow to cause it to go over that.

Now...you will gain ZERO performance on a stock engine over a properly working 84 pump by switching to a later pump. The 85-91 pump is, however, more readily available, and not much more money, if any. It also allows for future mods. When my original pump on my 84 went bad, I went with a 85 pump for that reason.

I'm not going to address the OPs reasons for wanting the information as that is his choice not mine......I will make available what I know about the topic and allow him to make up his mind........but now he is armed with the actual facts that will enable him to make the BEST decision.

To quote someone

RACE ON!

 

fuel filter is on the passenger side frame rail. it should be just below the door. although this is for an 86 so I am not sure if it holds true for yours but it is easy to see

 

^^The fuel filter for an '84 is in the same spot