Engine/Transmission (1998.5 - 2002) RV275 injector with BOOST?

[DMcLeod]

Question:



After I installed the injectors and changed fuel filter, I went to fire it up, having all 6 injector lines tight. (I've read on here that you do not need to air bleed by loosening lines - these injectors are self bleeding) Prior to cranking, I filled the filter canister and bled air out the VP test port by bumping the starter and cyling the lift pump 3 times. Well, on the 3rd 10sec cranking session I figured I would crack 3 lines, but glanced at the lift pump gage, and no pressure while cranking. So what I tried next was: bump the starter so the lift pump fired up, and then while there was lift pump pressure, I started cranking, and the Cummins lit, stumbled a little, and then smoothed out and ran like a Cummins.



Was this a coincidence? Or did it help for me to bump first, then crank? I guess the lift pump doesn't run while cranking (I had forgotten this) to avoid some starting issues on some trucks (as I understand it).

 

[cerberusiam]

Its a jerk pump, the lines need to bled for a quick start. Bumpng the starter or cycling the key until the system is full of fuel to the IP is the best way to minimize cranking times.

 

[bromano676]

I know 5 is asking for trouble. that's why there is an airdog sitting on the bench.

 

[DMcLeod]

Jerk pump?

I agree cracking the lines would lessen the cranking, but sure wasn't bad the way I did it.

New lift pump on the way.

 

[NIsaacs]

Keep us posted on the before and after boost fooler performance numbers/seat of the pants feel. Also with the new lift pump and type.



My guess is before the summer is up you will have some type of "box"



Thanks, Nick

 

[cerberusiam]

Jerk pump?

I agree cracking the lines would lessen the cranking, but sure wasn't bad the way I did it.

New lift pump on the way.

Jerk pump - the pump supplies the pressure to individual injectors to "jerk" them open.



There is no way to self bleed the injectors in this type of system and do it quickly, you just have to crank until the pump pressure overcomes the air pressure. The pump needs to have head pressure for the vane pump to purge air from the case to start feeding the high pressure system.



Once you have fuel under pressure at the IP inlet cracking the lines and a 5 second crank normally has fuel to the injectors. Tighten the lines and it should fire on the next crank, it will be rough and a little smoky but should finish purging air form the lines.



Just a way to minimize cranking and potential dry spin on the pump.

 

[DMcLeod]

NIsaacs - will do. New lp will be a FASS HPFP. (box ready:-laf) $ouch$!



cerberusiam - understood and agreed. Thanks for the explanation. For some reason (it was late) I had them all torqued - so thought I'd try it without (lazy) cracking the lines and it did work. Cracking the lines would be better (5 seconds of cranking instead of my 30sec). To my benefit the lines were only removed at the head, not the pump, so were still full of fuel.

 

[DMcLeod]

Update....7500 miles later

Injectors and fooler are awesome combo. Mileage went up a couple, plenty of power for passing, pulling hills, etc. I can take the boost up to 33 or so (I havn't messed with the allen screw adjustment on the elbow yet). No smoke to speak of (unless you forget to plug in the map sensor). I'm glad I didn't stop with just injectors - the added boost makes all the difference.

 

[John - K5AWO]

I've got the same stuff being talked about here. See my signature.

I just love to occasionally play with the Camaros and the Corvettes...

I can beat them to the opposite crosswalk before they quit spinning their tires.

I also enjoy just playing with the throttle just a tad, not much, you know when the guy in the right lane is trying to edge up on you and jump in front of you while the signal lights in front are bright RED?

That big ole ugly looking 98. 5 can sure jump and surprise 'em.

 

[jeepit]

Injectors and fooler are awesome combo. Mileage went up a couple, plenty of power for passing, pulling hills, etc. I can take the boost up to 33 or so (I havn't messed with the allen screw adjustment on the elbow yet). No smoke to speak of (unless you forget to plug in the map sensor). I'm glad I didn't stop with just injectors - the added boost makes all the difference.

Where did you end up purchasing the 275's from?

 

[DMcLeod]

Vulcan compound turbo components, AirDog Systems, FireBall injectors, DrawStraw™, Big Line Kits, VP silicone boot kits, gauge installation components, metric adapters & fittings, FASS, Quadzilla, Edge,AirDog, DTT Trans, ISSPRO, HTT Turbo, AFE, Veg pu

They are one of many vendors selling RV275's.

 

[DMillard]

Where did you get the elbo and boost fooler from? I just ordered some rv275's.