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fuel pressure check on 98 gtx rfi
- Thread starter Dtrain55!
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I have found a couple that have that sputter at a steady RPM. Recently in my troubleshooting of a particularly cantakerous RFI I cleaned the connectors on the coil, the 3 wires and the single wire plugs. The spark looks much stronger and more consistent. I use the spark checkers on both plugs to see what the engine is doing. I find it very good information and simple to do. If you do your check in the late evening or in a location with less light you can really see a dim or intermittent spark. Checking at the spark plug is very inconclusive. Also never underestimate spark plug issues. Even new ones can misfire. Good Luck
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Dtrain55!
Member
my fuel gauge arrived today, I put it inline with a t. when I put dess on the pressure only goes to 54 then starts bleeding down . same when running when I rev it a little goes below 54 comes back. That pressure is a little low. Just put new bosch fuel module in and had injector man from fla do the injectors. ?
The gauge could be off a bit. Low fuel pressure would not be the source of your mid-range sputter. a couple pounds low isn't gonna affect things too much. Did you do a fuel pressure check with just key insertion to see if the fuel pressure regulator is leaking? Insert the key a couple times get the pressure to 56 PSI then see if it holds that pressure. I had a ski that dropped to 20PSI over a minute and it still ran decent on the water.
Dtrain55!
Member
with key goes to 54 holds for 1/2 sec then loses pressure down like yours about 20. I checked both plugs at same time for fire, nice and strong on both. I did find one sensor that was out of specs,ordered it today but I cant believe that a water temp sensor would have any thing to do with problem
I tried ordering a regulator from amazon and it only held 48psi. The vendor said they didn't know which one we'd receive. I'd try Quantum for a regulator, fuel pumps are cheap as well. I have a spare set up in my parts box. 
Quatnum fuel systems if having a sale startin tomorrow.
Quatnum fuel systems if having a sale startin tomorrow.
That wide clip across the top of the regulator comes off and you can wriggle the regulator out of the counterbore. I think there is an O-Ring in there.
KyleW2
Well-Known Member
Don’t want to thread jack but have you used the Quantum pump with any success? Tempted to order one for my 99 GTX during the sale but not sure if it’s reliable or notI tried ordering a regulator from amazon and it only held 48psi. The vendor said they didn't know which one we'd receive. I'd try Quantum for a regulator, fuel pumps are cheap as well. I have a spare set up in my parts box.
Quatnum fuel systems if having a sale startin tomorrow.
The quantum pump for the RFI isn't gonna have the issues of the 951DI's pump because the pump pressure is much lower. People have been buying the Bosch Pump for the RFIs at local auto parts stores for a long time and not having any issues. I like Quantum because at least they are providing Seadoo owners with products to keep our skis running. I think I bought a fuel regulator from them as well but those are in my parts box.
Just a note but you have to correct the Temp sensor resistance reading for the current temperature as it will vary. For that sputter I'd say you have a wiring connector breaking down. From my recent experience I'd disassemble the 3 wire connector to the coil and the single wire, put them back together after cleaning both ends thoroughly and being careful not to enlarge the slots. Also, I found that wiggling the connector produced a better spark. You could also have some corrosion on the MPEM AMP plug pins. Sounds fishy but those little things we can't measure are the problem sometimes. Good Luck !
I think you are referring to the check valve at the bottom of the fuel canister. First the little red rubber then the washer goes on top. Be careful as sometimes when you are arguing with the fuel canister and pump the rubber check valve can get out of position. Check the resistance on the fuel sending unit. I clean them off with a pencil eraser to make sure they make good contact. Good Luck !!
Dtrain55!
Member
I purchased the fuel module on ebay. It was a bosch part but could only get 54 psi on fuel pressure gauge. I then bought a quantum kit regulator and pump and filters, installed it and got 60 psi on the gauge. deffinatly more pressure. I havent been able to try ski since .Probably cant till next spring. I live near Indy. Ive been cleaning all the plugs I can to try and find sputter.
Dtrain55!
Member
I had the problem 2 summers ago after purchaseing the ski and fixing. over last winter I ended up cleaning all the contacts on the complete ski computers and all plus all sensors on the engine and checked them for spects then rebuilt raves installed new checkvalve in rave system put in water this last june .Ran great all summer no problems then at the end of season started the same thing a little. I cleaned raves and it cleared up again .Etemplet advisied all those things. there are in this post, There is a great deal of knowledge on this forum. Popps knows alot also Thanks to all who made my summer great. There is a supplemental manual that goes with the rfi that tells all the specs I have a extra one if you need it Good luck
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