RotaryRevn

Ok, who's using this bosch fuel pump for their first gen? I'd like to use it for my turbo project but there are a couple probs. The main problem is that the pulsation damper seen here on the stock gslse pump doesn't screw onto the end of the bosch pump due to different threads. I know I don't need to use the damper but what will I screw onto the end to close it off? Also, the stock hardline that comes off of the pump seems a bit loose on there. How did you guys who are using this pump set yours up? I also noticed that the intake tube on this pump is much bigger than the stock pump. I am using the stock gslse pickup tube from the gas tank and that stock hardline that runs down towards the pump. Do I just put some kind of expander in there to join a larger fuel line with the smaller or just try and stretch the stock hose over the inlet on the bosch fuel pump?

I'd like to use this bosch because I already have it and all but I may just go with the walboro since there's already a write up in the Chronicles of a T2 swap thread.

Can someone help me figure this all out? I know a few of you guys are running this pump.





Microtech currently getting wired. Microtech should be wired by tonight hopefully

680RWHP12A

you will need to get custom fittings to make the bosch pump easy to plumb... try ormebrothers.com
they will have any specialty fitting you will need

RotaryRevn

Thanks! I'll check that place out.

Rafy13bt

I do I am using one I did the entire fuel lines new using braided line #10 from the tank to the pump, #8 from the pump to the engine and #6 for the return line to the tank. You have to buy fittings and the braided line and also my fuel rails are custom made. Its expensive I spend about 700 bucks between fittings lines and rails. It runs about 40 or 50 psi, also you need a fuel press regulator, have fun...

renns

I had a similar problem finding fittings, as the pump outlet has a coarse thread, and I couldn't find a compatible banjo bolt. I end up modifying that 'banjo stud' from the pump, and turned it into a 'banjo bolt'. I brazed in my own outlet tube to the banjo ring to match the direction I wanted it to aim, and it works just fine.

web777

I took off that spring thingy at the inlet, then used a banjo bolt (from Rotaryshack - Thanks Robert!) with the stock hardline. It was loose but nothing that oversized washer wouldn't fix. Let me know if you need an extra hand.

RotaryRevn

Ok, thanks for all the idea's guys! It's interesting to see and hear how you guys did it. It takes me awhile to picture this stuff. Anyways, I now actually have 2 ways to go with it using the stock lines.

Today I was at Mazdatrix picking up some parts. I showed Jon my pump and he was able to supply me with a banjo bolt that works perfectly. I think I just need to saw off like 2 threads to shorten the banjo bolt abit.

One thing Jon did mention was that spring that runs through the middle of the stock outlet stud (thingy ). He said the job of that spring is to act like a check valve and keep the lines pressurized and fuel at the injectors when the car is off. This is so you don't have a fuel hammer situation (just like when your running your shower and you slam the valve shut, the water suddenly stops and shakes the pipes in your house...if you have old pipes...hehe). Anyways that spring keeps the fuel from rushing forward each time with some force. He said it should be fine to use the banjo bolt but it was just some fyi stuff.

Anyways, he said the best situation would be if I could wire the fuel pump to be able to turn it on with like 4 volts first to send the fuel up slowly then give it the full power. But of course that's way too much work.

So anyways I was soo happy to just have the banjo bolt with the proper threads. When I got home, I decided to look around at the junk yard because I knew Mercedez used bosch pumps. Sure enough, I found one and the Bosch pump had this cool cap like piece that threads onto the area that's giving me the problem. I got home and tried out the cap, it fits perfectly and now I can use the stock piece (with the spring), the stock gslse metal tube and the cap!!

So there's my novel, I'm probably gonna try the cap first and just see if it works. I'll post some pics of that cap piece tomorrow when I get to my garage.

thanks again guys.

RotaryRevn

Ok, here it is. I decided to use that "cap" piece that I took from the Mercedez in the yards. Worked perfect and I was able to use the stock stud piece that came with the pump! Now I just need to figure out how to connnect that large nipple inlet to the smaller supply line. You know, that hard line that runs down the frame rail on a gsl-se. I'm hoping to find the right size hose for that nipple with a 90 degree bend, then get some kind of in-line reducer to connect with the smaller hose that comes off of that hardline. Any ideas?

renns

I convinced a piece of 3/8" hose to slip over the pump inlet. One brand of hose I had wouldn't expand that much, but the other would do it. Both were the std low-pressure fuel line.