Topic: How to do fuel system test, with no test port on fuel rail??

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  • ccf111’s Profile Photo
    Apr 20, 2008 at 5:24 pm
    Hey all, I wish I was here to brag about or join some elite Beretta club, unfurtunately for me, it merely gets me from point A to B...

    Currently I'm trying figure out how exactly to check each individual component of the fuel system. Every now and then it will die after starting up. But after starting again, or after a couple times, it will stay running. Could be leaking injectors, dying pressure regulator or pump...wish I had the test port on the rail.

    My question to anyone who may help is, how do you do the various pressure tests when you don't have the port to conveniently connect to. I've looked around on the net and yet to find a straight answer. Figured I better ask directly on a message forum. I did see someone talking about a device which goes in place of the fuel filter, and then about a t-fitting-just no concrete, exact how-to's.

    If you can help me out with this, I'd be grateful!



  • DrDodge’s Profile Photo
    Apr 26, 2008 at 10:40 pm
    if its a 2.5 cid, thats the way to go , the "T" fitting replacing the filter,, its a bitch, but it works,
    now, if your creative, you could disconnect the fuel line at the throttle body, and get some fittings from your local hardware store, and rig something up,

    rember ,, those are only going to have 9-14 PSI,


    Edited Apr 26, 2008 at 10:41 pm

  • ccf111’s Profile Photo
    May 6, 2008 at 5:39 pm
    Thanks for the reply Dr. Dodge. I added a different regulator and it seemed to be fine for about a day. I'm wondering if I install a new pump, would I need to absolutely replace the sending unit as well, or just the pump.

    It's a 2.2 litre, multi-port....I guess the silver lining could be that I end up learning more about automobiles as I go. Just not sure why there wouldn't be a gauge specifically designed to fit into the fuel line you're referring to (versus having to rig something up).



  • vair95’s Profile Photo
    Dec 8, 2008 at 9:32 pm
    I would probably go about it a little redneck, but here is my 2 cents. If you think you are starving a portion of the engine, or the entire engine for fuel, remove the injectors from the cylinders, and connect them to empty Mt. Dew bottles with some tubing. Bottom line, make the injectors spray into the bottles, and not the cylinders/intake manifold. Then crank the car, or better yet, have someone else crank the car over and you watch the injectors. they should all spray an approximately even amount and give the same pressure/spray pattern. If they do not, look in the book and find what the spray pattern should look like, then replace/clean the ones that do not match. As far as fuel pressure in the line before the injectors, there are aftermarket pressure gauges that you can install. A few questions for you: Has this car sat for an extended period of time? Is there a chance that something got into the tank that would clog the sending unit? When it is running do you see any fuel drips or leaks? If there is an inline filter, is it installed the correct direction, and is it clean? Personally I would take a trip to the store, get the haynes manual, and then start with the easy cheap stuff and move on up from there. Again like I said...might be a little redneck, but its just my 2 cents.


    My Corvair doesn't leak oil...It just marks its territory!

  • revhard’s Profile Photo
    Dec 9, 2008 at 2:47 am
    Cris this is Rev Hard & I've checked several of my resorsces & I found that if you look in the business section you'll find I LOVEBODYKITS.COM log on to them & put in your make , model, & year of vehicle & they've got the part that you'll need to fix the fuel line problem youre haveing ,it's a fuel system addapter that you can connect dirrectly to the fuel system of your car I read your message several time but couldn't find the year of your Berretta so I put in 88-94 it doen't realy matter because they can help you just make sure you tell them that you are a Member of Motortopia so they will give you our Members discount!


    Race The Strip not the Streets - REV HARD

    Edited Dec 9, 2008 at 2:48 am

  • BigNuttyPaul’s Profile Photo
    Dec 9, 2008 at 10:25 am
    2.2L? so it is a quad 4? if some are you sure it is a fuel problem? the quad4's are known to have problems with the ignition systems. also do you have a coolant temp gauge in your car? if the coolant temp sending unit goes bad a most gm fuel injection it will try to dump more fuel then the car can take on start up. it will think the car is at -34 or some where around there and dump a lot of fuel to try to start it.

    not sure if this will help at all.


    Racing is only done on tracks. Anything done on the street is for your ego not for sport.

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