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Username Post: 350 Ram Jet fuel pressure regulator test ??        (Topic#365517)
Arkie 
Newbie
Posts: 2

Reg: 06-14-21
06-14-21 02:30 PM - Post#2821601    

I have a 350 RamJet that was running fine and died at stoplight. I barley got it home and have replaced fuel pump. It has 40 psi past the fuel filter and 40 psi at the rail. In the fuel rail there is another psi check point not 8'' past the pressure sensor and there is no pressure in the rail ? The regulator vacuum line is not split or leaking. I pulled vacuum at the regulator diaphragm and it is not torn. I have Russel push lock lines and Holley Terminator X Max for electronics. I doubt if there is 500-600 miles in my car. Any help would be appreciated. Thank you, Arkie.



 


Rick_L 
Member #409
Posts: 27879
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
06-14-21 03:08 PM - Post#2821602    
    In response to Arkie

If you have pressure at the rail and no pressure 8" away from it, there is a blockage between those two places. Either that or you are expecting pressure where it shouldn't be.

Where is your regulator mounted?



 
Arkie 
Newbie
Posts: 2

Reg: 06-14-21
06-14-21 04:33 PM - Post#2821605    
    In response to Rick_L

There are no restrictions in the rail , and the regulator and return line are on the other side past all injectors= factory GM. Other than Terminator x Max it is just like it came out of the crate from GM. My Holley tech just got on my laptop and the tune has not changed.



 
Rick_L 
Member #409
Posts: 27879
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
06-14-21 06:20 PM - Post#2821606    
    In response to Arkie

If there are no restrictions in the rail but you say you have pressure at one spot on the rail and not at another, that is impossible. I suspect that both locations are not really on the rail.



 
acardon 
Ultra Senior Member
Posts: 11478

Loc: DFW TEXAS
Reg: 03-25-05
06-17-21 11:16 AM - Post#2821723    
    In response to Arkie

There won't be any pressure past the regulator. Where is the pressure port your referring to. The only port on my Ramjet is in the middle of the passenger side log. The fuel pressure is completely mechanical, no electronics involved. The regulator bleeds ofF any pressure higher than its set point and the return line is open to the tank, so it won't have any pressure.
Link to regulator.
Link to pressure port.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


Edited by acardon on 06-17-21 04:34 PM. Reason for edit: No reason given.

 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17648
grumpyvette
Age: 73
Loc: FLORIDA USA
Reg: 03-16-01
06-17-21 12:29 PM - Post#2821729    
    In response to acardon

http://www.grumpysperformance.com/Feb2021/ffft.gif

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 06-17-21 12:32 PM. Reason for edit: No reason given.

 
cbernhardt 
Senior Member
Posts: 571
cbernhardt
Loc: Lexington,NC
Reg: 08-28-00
06-19-21 03:05 AM - Post#2821786    
    In response to Arkie

The Ram Jet 350 specifications call for a fuel pump operating pressure of 43 – 55 PSI. Fuel pressure at the rails should be 41 – 47 PSI. I think my engine measured 45 PSI when new. I added an adjustable pressure regulator and reduced the pressure to around 40 PSI and it ran fine.

Will the engine start and idle?
When you measured the 40 PSI was the engine running?

Evidently got the engine started when the problem occurred, so what were the symptoms?

Does the Terminator have a Limp Mode?

Did you ever have the engine running with the stock GM controller?



Edited by cbernhardt on 06-19-21 04:05 PM. Reason for edit: No reason given.

 


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