Accel fuelpressure regulator problems

[Doktor-t]

Today I installed a Accel adjustable fuelpressure regulator and I´m very confused.

The car is a 88 Corvette with stock 350 TPI engine. The fuelpressure is set to the lowest possible.

1. With the engine at Idle the fuelpressure (vacuumlines connected) is 49-50psi. Revving up the engine and the pressure rises to 55 psi.

2. Tried another way to perform pressuretesting. With engine at idle and the vacuumline disconnected and the plenum vacuumfitting plugged. The fuelpressure is now at about 55psi at all times.


What am I suppose to do? I think the pressure is a littlebit to high, right?

What would be the most perferrable way to check fuelpressure?

Has any of you guys have any issues with accel regulators?


If I could get my hands on the speedshop owner who sent me this regulator by mail order.... Grrrrrrr!ad

Tobias, Sweden

 

[ccmano]

Your fine.... take the reading with the vacume line removed, that will give you max pressure, that's what you want to see. IMO 55psi is too high. I run 47-50...just crank it down a bit.
Good luck...

 

[bossvette]

yes the fuel pressure reading you want is with the vacuum line removed

 

[Doktor-t]

Fuel pressure

I´d crank it down if it was possible. 55 psi is the lowest this regulator can manage.

It has to be something wrong with its construction.

 

[Doktor-t]

accel

I sent accel a question and discription of the installation issues that been present. Hopefully they can help-out.

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Letter



Hello!

I reasently installed your Adjustable fuel pressure regulator (part nr 74750) and got great issues with it.
1. The tiny torx bit supplied in the kit didn´t fit the securitybolts that hold the regulator housing to the fuelrail. It havn´t got the little hole at the end that is cruicial.
2. The vacuumfitting that´s thread in from the side into the regulator housing interfere with the diaphragm spring and causes binding of the spring.
I therefore had to remove the vacuumfitting and file the threded end down to the right length. After that I reinstalled it with some threadsealer in the threads. So far so good.
3. Found out after I re-assabled the plenum that the allenheaded bolt isn´t adjustable with the plenum installed.
Had to unbolt the plenum once again and started to search for a bolt that had the right threads and also a 6 point head that would be possible to reach with a 7-8 mm wrench. Didn´t found any so therefore there were nothing more to do than hitting the allenhead bolt with a file and make it square. Thereby possible to adjust from the side instead, with the plenum mounted.
3. After these problems were solved the engine was re-assembled and ready for start-up. After letting the fuelpump work up the fuelpressure 3 times I hooked up a fuelpressure gauge.
The car started instantly and the fuelpressuregauge showed a fuelpressure of 65 psi. Way to high so I started to adjust the regulator by turning the little bolt counter clockwise. After a while the pressure got down to 55 psi.
Since this is still to high according to several sources I tried to lower the pressure even more but it wasn´t possible!? The adjustment bolt didn´t got any of the springload anymore and by turning it a few revs more the bolt fell out of its threads. The fuelpressure was as low as it could go!
The pressuretest was performed with the vacuumline un-attached. The vacuum line was plugged with a small bolt.
I even tried to perform a pressuretest with the vacuumline attached and then the pressure was 50 psi at idle and when revving the engine it got up to 55 psi.
I used the diaphragm supplied in the kit.
I have installed several regulators in the past (non of them were Accel made though) and there shoudn´t be any probs with such an easy installation as this is.
After three hours of work I gave up though. Knowing that the installation normally takes about one hour I was really aggravated.

Hopefully you guys can help me with these problems in a suitable way.

Regards//

Tobias Pervik, SWEDEN