# Problems With RB Fuel Delivery **URL:** \ **Category:** SON240sx Automotive\ **Created:** [March 22, 2010, 10:31am UTC](https://forums.speedlife.net/t/problems-with-rb-fuel-delivery/151973 "2010-03-22T10:31:23Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![92RB20DET](https://avatars.discourse-cdn.com/v4/letter/9/43a26b/32.png) [@92RB20DET](https://forums.speedlife.net/u/92RB20DET)\ **Post date:** [March 22, 2010, 10:31am UTC](https://forums.speedlife.net/t/problems-with-rb-fuel-delivery/151973/1 "2010-03-22T10:31:23Z")
Car is a s13 with RB20DET So I found the problem with my old fuel pump was that it kept blowing the Fuse when starting . So I took out my Spare pump from the old s13 ( which Used to have the same RB in it) and It doesn’t Blow the fuse. This “New” pump doesn’t blow fuses, but when the car gets up to like 5000 RPM, it limits out as if the fuel is getting cut. Before I run out and buy a Walbro, Is there anything else it could be? Any Help is Appreciated. ---
**Author:** ![Sandersb4671](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sandersb4671/32/5693_2.png) [@Sandersb4671](https://forums.speedlife.net/u/Sandersb4671)\ **Post date:** [March 22, 2010, 11:11am UTC](https://forums.speedlife.net/t/problems-with-rb-fuel-delivery/151973/2 "2010-03-22T11:11:27Z")
Have you checked vacuum/boost connections? Is this 5000rpm on boost? Or off? Have you tried taking it to 5000rpm but keeping it off boost? Did this problem happen in the old 240? Did you change anything in the new one? lol sorry for all the questions, I’m trying to understand the problem better but it helps to know the conditions it occurs under. It sounds like a boost leak to me. -Bill ---
**Author:** ![Martino](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/martino/32/5674_2.png) [@Martino](https://forums.speedlife.net/u/Martino)\ **Post date:** [March 22, 2010, 1:30pm UTC](https://forums.speedlife.net/t/problems-with-rb-fuel-delivery/151973/3 "2010-03-22T13:30:51Z")
If it’s in boost…check your plugs. Out of boost…fuel pump Had the same issues with my RB. ---
**Author:** ![92RB20DET](https://avatars.discourse-cdn.com/v4/letter/9/43a26b/32.png) [@92RB20DET](https://forums.speedlife.net/u/92RB20DET)\ **Post date:** [March 22, 2010, 2:38pm UTC](https://forums.speedlife.net/t/problems-with-rb-fuel-delivery/151973/4 "2010-03-22T14:38:11Z")
Nothing Changed Since the swap… And to my knowledge, the cars should be identical now… Plus its got brand new plugs. The car is up on stands right now(power Steering) so I cant test it… I know with no load on the engine it can do full rev range. But When in gear, It limits/ chokes out at somewhere around 5000 rpm ---
**Author:** ![92RB20DET](https://avatars.discourse-cdn.com/v4/letter/9/43a26b/32.png) [@92RB20DET](https://forums.speedlife.net/u/92RB20DET)\ **Post date:** [March 23, 2010, 9:20am UTC](https://forums.speedlife.net/t/problems-with-rb-fuel-delivery/151973/5 "2010-03-23T09:20:43Z")
Any more help? ---
**Author:** ![ughson](https://avatars.discourse-cdn.com/v4/letter/u/e0b2c6/32.png) [@ughson](https://forums.speedlife.net/u/ughson)\ **Post date:** [March 24, 2010, 1:38pm UTC](https://forums.speedlife.net/t/problems-with-rb-fuel-delivery/151973/6 "2010-03-24T13:38:05Z")
yo is this mitch from mech eng at UOIT? ---
**Author:** ![kix89](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/kix89/32/5689_2.png) [@kix89](https://forums.speedlife.net/u/kix89)\ **Post date:** [March 24, 2010, 3:05pm UTC](https://forums.speedlife.net/t/problems-with-rb-fuel-delivery/151973/7 "2010-03-24T15:05:37Z")
sounds like it isn’t getting enough fuel to me. check your FPR maybe? ---
**Author:** ![92RB20DET](https://avatars.discourse-cdn.com/v4/letter/9/43a26b/32.png) [@92RB20DET](https://forums.speedlife.net/u/92RB20DET)\ **Post date:** [March 25, 2010, 7:37am UTC](https://forums.speedlife.net/t/problems-with-rb-fuel-delivery/151973/8 "2010-03-25T07:37:18Z")
The Fuel Pump Started making a pretty loud noise this morning when I switched power to it… so I think that Its just on its way out. Ordering a Walbro Today, hopefully that Will fix the problem. and Yeah this is Mitch ---
**Author:** ![Sandersb4671](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sandersb4671/32/5693_2.png) [@Sandersb4671](https://forums.speedlife.net/u/Sandersb4671)\ **Post date:** [March 25, 2010, 7:43am UTC](https://forums.speedlife.net/t/problems-with-rb-fuel-delivery/151973/9 "2010-03-25T07:43:58Z")
What did you gap your plugs to? ---------- Post added at 10:43 AM ---------- Previous post was at 10:43 AM ---------- And if you have it in gear, if you keep it out of boost does it do the same thing? ---
**Author:** ![92RB20DET](https://avatars.discourse-cdn.com/v4/letter/9/43a26b/32.png) [@92RB20DET](https://forums.speedlife.net/u/92RB20DET)\ **Post date:** [March 25, 2010, 3:59pm UTC](https://forums.speedlife.net/t/problems-with-rb-fuel-delivery/151973/10 "2010-03-25T15:59:59Z")
I set the gap to the same as the gap from the previous plugs