Odd Air intrusion

[NTOLERANCE]

Just some food for thought here.

If I am on my front tank and the level is rather low - say below 1/4 tank like about 1/8 tank, and I park on a hill with the front end higher and let the van sit over nite, when I fire it up in the am, It will fire and run for a second then die - tons of cranking is needed after this to get it fired.
PArk on level ground - no issues. I think the tank pick up is coming uncovered with fuel, allowing air to seep in from the tank into the lines and thereby letting the fuel go back into the tank.
I have good return line o rings and good olives. Again, level ground - no issues. havent tried parking on a hill nose down yet.
If I let the van sit for a few hours - fires up and runs no issues.

Since my rear tank runs WMO and I shut down and fire up on the diesel filled front tank I havent tested the rear tank to see if this is the case.
Maybe my front pick up is broken off or short or whatever- does a van have a shower head? I had shower head issues on my F250 and my van doesnt act like that. (loosing fuel in curves of on off ramps)

Anyone else have this happen?

 

[tbrumm]

My truck does the same thing when parked on a slope, but does not do this when driving. I know my tank pickup is good because I replaced it and the pickup get right down to within 1/8" of the bottom of the tank. I think this happens because the front tank is so long - all the remaining fuel runs to one end or the other uncovering the pickup. In the case of the rear tank, it is square and the fuel can't really go to one end or the other so it doesn't uncover the pickup. I am making the assumption that the van tanks are similarly shaped to the truck tanks.

 

[Rot Box]

I had the same problem with my 91. I completely rebuilt the fuel filter housing with a new o-ring for the fuel heater and a new one way valve for the return line (the brass fitting where the rubber hose attaches has a small valve inside of it..). Problem solved it starts and runs good now Good luck,


Here's some info on that check valve if you're interested: http://www.oilburners.net/forums/sh...7-3-filter-head-check-valve-advise&highlight=

 

[NTOLERANCE]

Yes. Van tanks are Similiar to trucks.

 

[jim_22]

My truck does the same thing when parked on a slope, but does not do this when driving. I know my tank pickup is good because I replaced it and the pickup get right down to within 1/8" of the bottom of the tank. I think this happens because the front tank is so long - all the remaining fuel runs to one end or the other uncovering the pickup. In the case of the rear tank, it is square and the fuel can't really go to one end or the other so it doesn't uncover the pickup. I am making the assumption that the van tanks are similarly shaped to the truck tanks.

I do the same thing (2 tank alternate fuel) and my fix is what Rot Box said except it was easier for me to just replace all the fuel lines, filters, and switching valves. BTW why not run the WMO in the front tank so it is a shorter, easier pull? Also a flat plate heat exchanger on the non-diesel fuel line is a simple, cheap and very effective addition.

 

[NTOLERANCE]

Does a 90 E van have showerheads?
I seem to have a lot less power on the front tank I'm thinking I've got some sort of obstruction if I go through a roundabout all of a sudden the engine to pick up a lot more power
Also I just found out I can only pull about 11 gallons out of the front tank should be something close to 15 I'm guessing something's broke off in there