RB20det fuel problem...need some help

Discuss the RB20, RB25 and RB26 series engines.
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legit240sx
Posts: 322
Joined: Thu Sep 18, 2008 12:42 pm
Car: 91 240sx rb20

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Best to start with the mods that affect:

Freshly rebuild silver top (0 miles)440cc w/ resistor boxCarl H rom tunebrand new CASWalbro 255

Problem is im getting no fuel in my cyl. which i've diagnosed to the best of my knowledge.

I have gas pump prime. (correct wiring from fuse box to ECU splice)I have one constant pwr and one trigger on the injector plug.i have the lines hooked up right.(checked and double checked) I have 1.8 ohms across the first three injectors.The rom tune is for 440cc with a blow thru maf set up.

turned over 10 times adjusting the CAS every which way.took out 1, 4, 5 spark plug with no fuel or suet on them.turned over with the plugs out just to see if i can get some spray or smell but got neither.Before i rebuilt the engine it would start up with the stock 270cc.

Any ideas?


Joe
Posts: 6511
Joined: Sun Feb 09, 2003 8:29 pm
Location: Phoenix, AZ

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turn your ignition onremove the cam angle sensor

spin it by hand. you should head the injectors clicking.

Yellow4g63
Posts: 3718
Joined: Mon Jan 20, 2003 6:07 pm
Car: 95 Nissan RB20 240SX RB20
91 Nissan NX2000 VE power
95 Nissan 240SX Stock
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legit240sx wrote:Best to start with the mods that affect:

Freshly rebuild silver top (0 miles)440cc w/ resistor boxCarl H rom tunebrand new CASWalbro 255

Problem is im getting no fuel in my cyl. which i've diagnosed to the best of my knowledge.

I have gas pump prime. (correct wiring from fuse box to ECU splice)I have one constant pwr and one trigger on the injector plug.i have the lines hooked up right.(checked and double checked) I have 1.8 ohms across the first three injectors.The rom tune is for 440cc with a blow thru maf set up.

turned over 10 times adjusting the CAS every which way.took out 1, 4, 5 spark plug with no fuel or suet on them.turned over with the plugs out just to see if i can get some spray or smell but got neither.Before i rebuilt the engine it would start up with the stock 270cc.

Any ideas?
Is this a new swap? did u put the fuel line on backwards? is the green relay in near the ecu? one of them is for the fuel injectors?

User avatar
legit240sx
Posts: 322
Joined: Thu Sep 18, 2008 12:42 pm
Car: 91 240sx rb20

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Joe forgot to mention that, when i would spin the CAS i heard about two clicks in a full rotation but never a full six as it should be.

Yellow, i swapped the engine in stock about a year ago. It started and ran but later found that my compression was all but par. Every since ive been on a mild rebuild. Yes the fuel lines are on correctly. I do have a relay on but have yet to check its integrity.

question, if that relay happens to be bad would it affect the injectors from pulsing even though the injector plug has a constant and trigger? Or would it be that the 440cc injectors i bought are all crap... Also could it be that the trigger pulse is on the wrong side of the injector when wired in?


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